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Quick answer: Kitchen design mistakes are cheapest to fix on the drawing and dearest once the cabinets are built: a layout planned around today’s appliances, too few drawers, overlong shelves, vinyl doors beside the oven and power planned too late.
Every mistake on this list is cheap on paper. Moving a drawer bank on a 3D design costs a designer a few minutes; moving it once the carcasses are built, the benchtop is templated and the splashback is tiled means remaking cabinets. The decisions that make a kitchen annoying to live in are nearly all made before anything is cut, and most of them have a published answer if you know where to look.
We design, make and install cabinetry from our factory in Rosedale, where it’s made on German laser machinery, so this list comes from the cabinetmaker’s side of the job: the layout, the boxes, the doors, the hardware and what they cost. Where a figure is involved, it comes from the organisation that publishes it (BRANZ, Laminex, Dezignatek, Blum, WorkSafe) or from our own published price bands. The building side of a renovation, from moving walls to consents, belongs to a builder, and we’ll say where that line falls.
Kitchen Design Mistakes in the Layout
A layout mistake is the expensive kind, because everything else in the kitchen is built around it. These four are worth checking on any drawing before you sign it off.
Designing Around the Appliances You Own Today
It’s natural to draw a kitchen around the fridge, dishwasher and oven you already have. The trouble is that the cabinetry will outlast most of them. A fridge cavity built tight to your current fridge leaves you shopping by width when it fails, and an oven housing sized to one model’s cut-out may not suit the next one. Decide at the design stage which appliances are staying and which are being replaced, and get the installation instructions for the new ones before the cabinets are drawn.
Appliance makers publish the cavity sizes, ventilation gaps and clearances their warranties depend on, and those numbers belong on the plan, not on the installer’s phone on the day. If you haven’t chosen an appliance yet, say so, and ask the designer to allow for the size range you’re considering instead of guessing one model.
The dishwasher deserves its own line on the plan. It wants to sit beside the sink, so the plumbing and waste are short and plates go straight from rinse to rack, and it wants a clear standing space in front so its open door doesn’t block the main walkway. An integrated dishwasher also needs its door panel sized from the appliance maker’s instructions, which is one more reason to choose the model before the cabinets are made.
Planning the Triangle and Forgetting the Landing Space
The sink, cooktop and fridge triangle is a fine starting point, but it says nothing about where you put things down. Every hot or heavy item needs a landing spot: bench beside the cooktop for a pot coming off the heat, bench beside or in front of the wall oven for a tray coming out, and bench next to the fridge for the shopping.
BRANZ makes the same point in its universal design guidance for kitchens, recommending that a microwave be mounted at bench level with a bench surface or pull-out shelf in front, so hot dishes can be moved safely to the benchtop. That advice was written with accessibility in mind, and it’s simply good design for everyone. When you look at a plan, trace a pot from the cooktop to the sink and a tray from the oven to the bench, and see whether either journey crosses a walkway or someone else’s work zone.
Squeezing Walkways to Fit an Island
An island is easy to force into a room that can’t really take it. The cabinetry is the simple part; the space around it decides whether it works. The same BRANZ guidance, written for a kitchen a wheelchair user can work in, calls for a 1200mm minimum approach in front of all workbenches and appliances and a turning diameter of at least 1500mm. Most households don’t need those dimensions, but they’re a useful reality check, because a gap that feels generous on a drawing shrinks once the dishwasher door is down and someone is standing at the oven.
Our sister company Superior Renovations publishes the planning measurements for kitchen walkways and island clearances; check the drawing against them before you fall in love with the island. If the room can’t take one, a peninsula or a longer back run will often give you more working bench than an island squeezed into the middle.
One more layout question gets missed in open-plan homes: what the kitchen looks like from the living area. The back of an island, the side of a tall unit and the end of a run all face the lounge, and they need finished panels, not the plain carcass side you’d hide against a wall. Decide which faces are on show, where the bar stools sit, and whether the sink, the dishwasher or the open pantry is the first thing you see from the sofa. Those are cabinet details, so they’re cheap to settle now and awkward to fix once the boxes are made.
💡 Design tip: Tape the island’s footprint on the floor, then open the dishwasher, the oven and the fridge door into it. If you have to step around an open door to get past, the walkway is too tight for daily use.
Forgetting Who Else Uses the Kitchen
A kitchen drawn for the person who cooks most can be awkward for everyone else. BRANZ’s guidance has small details that suit most households, whether or not anyone in them has a disability: lever mixer taps are easier to use, and an extendable hose spray increases the range of use; cooktops with front or face-mounted controls avoid reaching over hot pots; staggered burners reduce reaching across the cooktop; and a wall oven set at eye level suits the person who uses it. If a grandparent, a child or anyone with limited reach or grip uses the kitchen, raise it at the first meeting. It changes drawer heights, handle choices and where the microwave goes, and every one of those is free to change on a drawing.
This is the part of the job our designers spend longest on, and it’s why a kitchen drawn around how your household actually cooks starts with questions about the people using it, not with a catalogue.
Wall Cabinets Nobody Can Reach
Wall cabinets run to the ceiling look tidy and give you more storage on paper, but the top shelf of a tall overhead unit is storage you need a step stool for. Decide what goes up there before you pay for it: platters and seasonal things are fine; anything used weekly isn’t. BRANZ’s kitchen guidance also describes electric lifts that lower a wall cupboard to a height a seated person can reach. They fit cupboards 500-700mm high, and one motor lift raises and lowers a unit up to 1200mm wide weighing approximately 100kg, with a typical range of 430mm down and 180mm out. Most homes won’t need one, but if someone in the house uses a wheelchair, it’s a cabinet detail to plan from the start.
Storage Mistakes Built Into the Cabinets
Storage mistakes don’t show on the day the kitchen is finished. They show six months later, when the bench is cluttered and the back of every cupboard is a mystery.
Too Many Doors, Not Enough Drawers
Base cupboards with a shelf inside are the cheapest storage to build and the hardest to use: everything at the back is reached on your knees. Drawers bring the contents to you, and on a deep base cabinet a full-extension drawer gives you the whole depth. There is one honest caveat, and it comes from BRANZ, which notes that drawers are easier to access for wheelchair users but may not be for elderly or ambulant people with a disability. If someone in the house struggles to bend or pull, try a loaded drawer on a sample before committing every base unit to drawers.
Hardware is the other half of the decision. Blum New Zealand’s warranty and maintenance statement says its box and runner systems are tested up to 100,000 opening movements and its hinge systems up to 200,000, and it puts the lifetime of a kitchen at around 20 years. Blum and Hettich hardware both carry a lifetime warranty on our published guarantee schedule. A drawer is only as good as the runner under it, so the quote should name the brand and the range.
Shelf Spans the Board Can’t Carry
A long shelf looks clean on a drawing and sags in real life, and the board’s own data sheet tells you how long is too long. Laminex’s Melteca technical data sheet publishes shelf loading span tables, worked to a final deflection of 0.006 times the span with the load spread evenly. These are the figures for the two board thicknesses most used for shelving:
| Shelf load (spread evenly) | 16mm, single span | 16mm, multiple span | 18mm, single span | 18mm, multiple span |
|---|---|---|---|---|
| 50kg per m² | 740mm | 840mm | 830mm | 940mm |
| 100kg per m² | 580mm | 590mm | 660mm | 670mm |
Source: Laminex New Zealand, Melteca technical data sheet (issued November 2022), shelf loading span tables.
So an 18mm shelf carrying 50kg per square metre is rated to span 830mm on its own and 940mm across multiple supports, and at 100kg per square metre, which is closer to a shelf of tins or plates, those figures fall to 660mm and 670mm. That’s why a 1200mm open bay with one long shelf is a design mistake, not a style choice. The fixes are simple if they’re made on the drawing: add a support, divide the bay, or step up the board thickness.
Corners, Bins and the Appliances on the Bench
Corners are where cabinet space disappears. A blind corner behind a hinged door is a cave; hardware that brings the contents out costs more, and whether it’s worth it depends on what you’d store there. Our guide to corner cupboard options and what each one gives back goes through the choices.
Two more things are easy to forget until the kitchen is in use. The first is rubbish and recycling, which needs a drawer near the sink and the prep zone, not a freestanding bin in the walkway. The second is small appliances. If the toaster, kettle, coffee machine and mixer all live on the bench, plan the bench length and the power for them, or plan a cupboard with power inside where they can live with the door closed.
Pantry Depth You Can’t Reach
A tall pantry 600mm deep with fixed shelves is a cupboard you’ll use the front third of. Internal drawers or pull-out baskets behind the tall doors fix that, and they’re far easier to build in now than to add later, because the runners fix to the cabinet sides and the internal widths have to suit them. Adjustable shelves in whatever stays as shelving let the pantry change with the household, and a light inside the tall unit is worth deciding on before the cabinet is made, for the cable reasons covered below.
💡 Design tip: List every item on your current bench and in your current pantry before the design meeting. It takes 15 minutes, and it’s the quickest way to check the drawing has somewhere for all of it.
Material Choices That Fail in the Wrong Spot
Kitchen materials rarely fail at random. Usually they’ve been put somewhere their maker says not to put them, and the makers’ data sheets are short, public and the cheapest insurance in a kitchen project.
Vinyl-Wrapped Doors Next to the Heat
Thermoformed doors are the vinyl-wrapped fronts used on many shaker and profiled kitchens, and they come with a published limit. Dezignatek’s thermoform technical data sheet says surface temperatures above 50 degrees Celsius may result in delamination, which isn’t covered by warranty, and it names the usual causes: heat-generating appliances, steam mops used under the doors, and placement above hobs and ovens where heat and steam rise. It also notes that darker colours absorb more heat.
None of that rules thermoform out. It rules out careless placement: keep vinyl-wrapped doors off the face directly above the cooktop, treat the oven maker’s clearances as a minimum, and think about afternoon sun on a dark colour. Our guide to thermoform doors and the 50°C rule covers profiles, cleaning and warranty in detail.
Board in the Wet Zones
The sink cabinet takes more water than any other box in the kitchen, from a dripping trap, a weeping dishwasher connection or wet hands on the door. Laminex is direct about Melteca’s limits: it’s for interior use only, any exposed substrate must be sealed before service, the substrate must not come in contact with any liquid, and the board must not be used in high humidity or wet areas.
The practical answer is detailing. Seal every cut edge, especially the holes cut for pipes; keep the plumbing joins where they can be reached and seen; and ask how the base of the sink cabinet is finished. The same data sheet says Melteca shouldn’t be used in constant wear situations such as sink bench tops, which is why a melamine-faced board is a cabinet material and not a benchtop.
The edges matter more than they look. The decorative face of a Melteca panel is tough, and Laminex’s own data sheet lists steam resistance testing among its performance results. The weak point is the board behind the face, which is why Laminex says panel edges should be finished with a PVC or ABS edgetape and any exposed substrate sealed. A cabinet that looks perfect can still fail from one unsealed cut-out under the sink.
Choosing a Benchtop on Looks Alone
The benchtop is the biggest single surface in the kitchen, and it’s often chosen fastest, from a sample on a showroom wall. Two questions are worth asking before you choose. The first is how it behaves where you’ll use it: hot pans, a busy sink, sun through a window. Ask the supplier for the care and warranty document for the exact product, and read what it excludes.
The second is what it’s made of. WorkSafe New Zealand says engineered stone can contain in excess of 90% crystalline silica, which is considerably higher than natural stone such as granite with less than 45% silica. The risk WorkSafe is managing is the dust created when the stone is cut and finished, so the fair question for whoever fabricates your top is how they control it.
Choosing a Finish Without Asking How It’s Cleaned
Every surface has a cleaning rule, and a finish that looked perfect at handover can be dulled in a month by the wrong spray. Dezignatek’s data sheet, for example, rules out abrasive cleaners such as Jif or Vim, steel wool, paint thinners, solvents, methylated spirits and citrus-based cleaners on its thermoform doors, and says steam mops aren’t recommended near them. Ask for the care guide for every surface in the kitchen before you choose, and choose the finish that suits the way your household actually cleans.
Planning Power, Light and Extraction Too Late
Services are the mistake you find the first day you cook. They’re also where a cabinetmaker’s job stops and a licensed trade’s begins, so the design’s job is to put the positions on the drawing early enough for the right people to do the work.
Power Points Where the Appliances Will Be
Count the things that plug in: kettle, toaster, coffee machine, mixer, phone chargers, the microwave if it isn’t built in, and anything inside a cupboard such as an appliance garage or a lit drawer. Then mark each one on the plan, at the height and position it will be used. Sockets are planned around the cabinetry, not the other way round, because a power point that lands behind a drawer runner or in the middle of a splashback panel is expensive to move later.
Important note: New sockets, island power and integrated lighting are work for a registered electrician. Moving or adding a sink is work for an authorised plumber or drainlayer, and removing or altering a wall, or cutting a new opening for a rangehood duct, can affect consent. Check with Auckland Council or a Licensed Building Practitioner before you plan on it.
Lighting the Bench, Not Just the Room
A single ceiling light behind you puts your own shadow on the bench. Task lighting under the wall cabinets fixes that, and it’s far simpler to plan before the cabinets are made: the cable route, the driver location and a channel or recess for the strip are cabinet details, and adding them afterwards means visible cable or a remade panel. Decide on lighting under the wall cabinets, inside the pantry and in any glass-fronted or open display unit at the design stage, and have the electrician confirm the layout. Pick one colour temperature for the bench, cabinet and pantry lighting, too: a warm strip under the wall cabinets next to a cool one inside the pantry is the kind of mismatch you notice every evening.
Leaving the Rangehood to the End
The rangehood is often chosen after the cabinetry around it has been drawn, and that’s backwards. Its width, the space it needs above the cooktop and whether it ducts outside all come from the rangehood maker’s installation instructions, and a ducted unit needs a route for the duct through the cabinetry, the ceiling or a wall. Get the model chosen, or at least its instructions in hand, before the overhead cabinets are finalised. If the duct has to go through an exterior wall or the roof, that part is building work for a builder.
Adding Plumbing as an Afterthought
A second sink in the island, a scullery tap, a filtered water outlet or a fridge with a plumbed ice maker all need water and, for a sink, a waste. Each is straightforward when it’s on the first drawing and disruptive when it’s added once the floor plan is fixed, because the cabinet above it has to leave room for the pipes, the trap and access to the joins. Put every water point on the plan at the start, tell the designer which ones are definite and which are maybes, and let an authorised plumber confirm what’s possible before the cabinets are made.
💡 Design tip: Ask for the electrical plan as its own drawing, separate from the cabinet layout. It’s the one document the electrician and the installer will both check against.
Budget Mistakes: Spending in the Wrong Line
Budget mistakes in a kitchen are rarely about the total. They’re about which line the money went into, and what was left off the quote.
Setting a Budget Without Knowing What the Parts Cost
Before you set a figure, it helps to see how the pieces add up. These are the bands we publish in our guide to kitchen cabinet costs in New Zealand:
| Line item | Range on our figures | What moves it |
|---|---|---|
| Cabinetry (supply and install) | $8,000–$55,000+ | Tier, run length, drawers, finish, corners |
| Benchtops | $2,000–$12,000+ | Material, length, edge profile, sink and hob cut-outs |
| Appliances | $3,000–$20,000+ | Brand, integrated or freestanding, how many |
| Plumbing and electrical | Quoted per job | Whether the sink, hob or power points move |
| Contingency | 10–15% of the cabinetry quote | Age of the house, what’s behind the old kitchen |
Within cabinetry, the same guide puts budget and flat-pack modular kitchens at $8,000–$14,000, mid-range custom at $15,000–$24,000, upper mid and premium at $25,000–$35,000, and high-end and bespoke at $35,000–$55,000+, all for supply and installation excluding benchtops and appliances. Most Auckland family kitchens land in the $15,000–$28,000 range for cabinetry alone. Its worked example: a $20,000 mid-range cabinetry quote, a $5,000 benchtop and a $6,000 appliance package come to $31,000, before a 10–15% contingency on the cabinetry of $2,000–$3,000.
Skipping the contingency is its own mistake, and the age of the house is usually why. In a pre-1940s villa or bungalow, walls are rarely square and floors are rarely level, so cabinets are scribed to fit and the old kitchen often comes out to reveal something nobody could see at the quote. In a 1970s or 1980s home, the plumbing and wiring behind the old cabinets may be due for attention once they’re exposed. None of that is predictable on day one, which is exactly what the contingency is for.
Spending on the Doors and Saving on the Hardware
The door finish is what you see, so it’s where money naturally goes. The runners and hinges are what you use every day. Our published supply figures put a melamine door at about $60–$110, a vinyl-wrapped door at $90–$140 and a polyurethane-painted door at $140–$200 or more. On a kitchen with 20 fronts, that’s $1,200–$2,200 in melamine against $2,800–$4,000-plus in polyurethane, before installation.
Spending that difference on doors while accepting unnamed runners is the wrong way round. Whatever you choose, make sure the quote names the hardware brand and range, not just “soft-close drawers”.
Not Asking What the Warranty Actually Covers
A warranty is only useful if you know what’s in it, and kitchens carry several at once. Our published guarantee schedule lists Melteca, Laminex, PrimePanels and Bestwood laminates at 10 years, Dezignatek doors at 10 years, Caesarstone at 10 years, Blum and Hettich hardware and Blanco sinks with a lifetime warranty, installation at 5 years and electrical workmanship at 12 months. The guarantee on the kitchen also transfers to the new owners if you sell. Ask any company quoting for the same list in writing, product by product, because a single headline figure on a brochure tells you very little about the hinge that fails in year three.
Read the conditions too. Supplier warranties assume the product was used and installed the way the maker intended, which is another reason the earlier mistakes matter: a door placed too close to the oven or an unsealed sink cabinet is a design decision, and a warranty isn’t designed to cover it.
Comparing Quotes That Describe Different Kitchens
When two quotes are thousands of dollars apart, check first whether they’re describing the same kitchen. One might include full-height pantry units, internal drawers and named Blum runners; the other a shorter run, shelves and unnamed hardware. Before you compare totals, compare the line items: board and finish, door type, hardware brand and range, benchtop material and thickness, what installation includes, and who handles the plumbing and electrical. Our checklist for comparing kitchen quotes line by line walks through it.
A fixed price only means something once the materials are chosen. Ours is a detailed fixed quote issued at that stage, after the design is final and before manufacturing starts.
💡 Design tip: Ask every company quoting to split the price into cabinetry, benchtop, hardware and installation. A single total can’t be compared with anything.
Signing Off a Design You Haven’t Properly Seen
The last mistake is approving a kitchen you’ve only seen as a floor plan. A plan shows where things go; it doesn’t show what the room will feel like to stand in.
Approving a Plan From a Floor Drawing Alone
Ask for 3D views from where you’ll actually stand: at the sink, at the cooktop, and coming in from the living area. Our process starts with a consultation at your home or at our head office, and a free preliminary 3D design and estimate are sent within 1-2 days. Use those views to check sight lines, the height of the wall cabinets against the window head, and how the island reads from the lounge.
Choosing Colours Under the Wrong Light
Door and benchtop samples look different in a showroom, on a screen and in your kitchen at five o’clock on a winter evening. Look at samples in the room itself, at the times you’ll use it, and look at the door colour and benchtop together, because each changes how the other reads.
A pale, detailed door can flatten out in strong light, and a dark one shows every shadow line in its profile. Sheen matters as much as colour: a gloss door bounces light around a dim kitchen but shows fingerprints in raking light, while a matt door hides marks and can look flat on a grey day. Neither is wrong. It depends on the room, the light it gets and who does the wiping.
Not Asking What Happens on Installation Day
Know the sequence before it starts. On our jobs, the cabinets are installed in 1-2 days, overseen by the project manager; the benchtops and splashbacks are templated once the cabinets are in, with installation about 10 days later; then the hob and oven are installed and connected. If your old kitchen is coming out, plan for the days without a working one, and ask early who is disconnecting and reconnecting the plumbing and power.
Not Knowing Who to Call When Something’s Wrong
Something small usually needs adjusting after a new kitchen goes in: a door that needs a hinge tweak, a drawer that catches, a panel gap that has opened as the house settles. Find out before you sign who you call and how it’s handled. On our jobs, a project manager is your point of contact from design to installation and oversees the installers, so there’s one person to ring, not a list of trades to chase.
Not Keeping a Record of What Was Specified
Ten years from now, a hinge fails or a door is damaged, and the first question is what was fitted. Ask for a handover record that lists the board and finish, the door profile and colour code, the benchtop material and colour, and the hardware brand and range for drawers, hinges and lift systems. It takes the installer minutes to compile at the end of a job and saves a lot of guesswork later, especially if you’ve sold the house and the guarantee has passed to the new owners.
Fix It on the Drawing
Every mistake here has the same cheap fix: catch it before the cabinetry is made. Draw the appliances you’ll actually own, give every hot pot and heavy tray somewhere to land, check shelf spans and door positions against the makers’ numbers, mark the power and lighting, and compare quotes line by line. If you’d like a designer to do that with you, in your own kitchen, that’s exactly where we start.
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What are the most common kitchen design mistakes?
The ones that cost most to fix are built into the cabinetry: a layout drawn around the appliances you own today, no landing space beside the cooktop and oven, too many shelved cupboards and not enough drawers, shelves spanned past what the board is rated for, vinyl-wrapped doors placed beside heat, and power and lighting planned after the cabinets. Each is cheap to change on the drawing and expensive once the kitchen is built.
How far can a kitchen cabinet shelf span before it sags?
It depends on the board and the load. Laminex publishes span tables for Melteca: at 50kg per square metre an 18mm shelf is rated to 830mm on a single span and 940mm across multiple supports, and at 100kg per square metre those figures fall to 660mm and 670mm. A 1200mm bay with one long shelf needs a support, a divider or a thicker board.
Can thermoform kitchen doors go next to an oven?
With care. Dezignatek says surface temperatures above 50 degrees Celsius may cause delamination that its warranty does not cover, and it advises against placing thermoform above hobs and ovens where heat and steam rise. Darker colours absorb more heat. Follow the oven maker's installation clearances, keep vinyl-wrapped doors off the face above the cooktop and settle door positions at the design stage.
How much space do I need around a kitchen island?
It depends on who uses the kitchen, but BRANZ universal design guidance is a useful check: a 1200mm minimum approach in front of workbenches and appliances and a 1500mm turning diameter for a wheelchair user. Superior Renovations publishes planning measurements for walkways and island clearances. Taping the island out on the floor and opening the appliance doors into it is the quickest test.
Are drawers better than cupboards in a kitchen?
For most base cabinets, yes, because a full-extension drawer brings the whole depth of the cabinet to you instead of leaving the back half out of reach. BRANZ notes one exception worth knowing: drawers are easier for wheelchair users but may not be for elderly or ambulant people with a disability. Try a loaded drawer on a sample if anyone in the house struggles to bend or pull.
How much does kitchen cabinetry cost in Auckland?
On our published bands, for supply and installation excluding benchtops and appliances: $8,000 to $14,000 for budget and flat-pack modular, $15,000 to $24,000 for mid-range custom, $25,000 to $35,000 for upper mid and premium, and $35,000 to $55,000 or more for high-end and bespoke. Most Auckland family kitchens land in the $15,000 to $28,000 range for cabinetry alone.
Can melamine be used for a kitchen benchtop?
Not as a working benchtop. Laminex says Melteca should not be used in constant wear situations such as sink bench tops, high use shop counters or bar tops, and that it is for interior use only, with any exposed substrate sealed before service. Melamine-faced board is a cabinet material. For the benchtop, choose a material made for the job and read its care and warranty document.
Do I need an electrician for kitchen power points and lighting?
Yes. New sockets, island power and integrated lighting are work for a registered electrician. Plan the positions with your designer, put them on a separate electrical drawing, and let the electrician confirm what is compliant. Plumbing changes such as moving a sink are for an authorised plumber, and removing a wall can affect consent, so check with Auckland Council or a Licensed Building Practitioner.
How long does kitchen cabinet installation take?
On our jobs the cabinets are installed in one to two days, overseen by the project manager. The benchtops and splashbacks are templated once the cabinets are in and installed about 10 days later, and the hob and oven are installed and connected after that. If your old kitchen is coming out, plan for the days without a working kitchen.
What should a kitchen quote include?
Enough detail to compare it with another quote: the board and finish, the door type, the hardware brand and range, the benchtop material and thickness, what installation includes, and who handles plumbing and electrical. A single total cannot be compared with anything. A fixed quote only means something once the materials are chosen, so ask at what stage the price becomes fixed.
Related guides
- Designing a small kitchen that still works hard
- Planning a kitchen island from the cabinetmaker’s side
- What each benchtop material costs per square metre
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References
- BRANZ, Universal design for kitchens
- Laminex New Zealand, Melteca technical data sheet (November 2022)
- Dezignatek, Thermoform Technical Data Sheet (November 2024)
- Blum New Zealand, Warranty and Maintenance Statement
- WorkSafe New Zealand, Engineered stone and exposure to respirable crystalline silica