Carpentry · Canada

FLHA for deck building

By Safety PaperworkBuilt from provincial OHS law and CCOHS guidance · How we write and check theseUpdated November 9, 2026

Provincial OHS law requires hazards to be assessed and controlled before work starts. A field level hazard assessment (FLHA) for deck building is done on site at the start of the shift and again whenever conditions change.

It lists the tasks, hazards and controls, and every worker signs on before starting and signs off at the end of the shift. The main hazards are falling from height, hitting underground services, falling through a floor opening or void and lifting and carrying heavy loads.

Make this FLHA now Word template PDF

FLHA example: deck building

This is a complete FLHA for deck building, with 6 job steps. Open it in the builder to add your site, crew and signatures, change anything, and download a PDF. Or download the free Word template below and fill it in by hand.

Field Level Hazard Assessment (FLHA)

Build a deck · Carpentry · Example

Document FLHA-001 · Rev 1

Job steps, hazards and controls

#	Job step	Hazards	Risk before	Controls	Risk after
1	Locate underground services before digging footings	Hitting underground services	Critical	Keep machine buckets well clear of marked services and use a spotter. Engineering (guarding) Scan the area with a cable locator before digging and mark services on the ground. Engineering Hand expose or hydrovac services before machine digging inside the locate tolerance zone. Engineering Click Before You Dig: lodge a locate request with your provincial one-call service and wait for the locates. Administrative Follow your province's ground disturbance rules and keep locate sheets on site. Administrative Keep plans or locate tickets on site and check them again if the work area grows. Administrative If you hit a service, stop, get everyone clear, and call the owner and emergency services. Administrative Wear safety boots, gloves and hi-vis when digging. PPE	Medium
2	Dig and pour footings, guarding open holes	Falling through a floor opening or void Wet concrete and cement burns Lifting and carrying heavy loads	Critical	Cover every hole and penetration with a fixed, secured cover marked "HOLE" or "DANGER". Engineering (guarding) Put guardrails with toe boards around stairwells, lift shafts, voids and open edges. Engineering (guarding) Install stairs early and fit temporary handrails as soon as they go in. Engineering Never remove a cover or guardrail without approval. Put it back straight away. Administrative Inspect covers and barriers daily and after other trades have been through. Administrative Use long-handled tools and pumps to cut down contact. Engineering Wash concrete off skin straight away with clean water. Administrative Have clean water and eye wash at the pour. Administrative Wear waterproof gloves, long sleeves and rubber boots with pants worn over the top. PPE Wear safety glasses or goggles to stop splashes. PPE Plan to avoid carrying: have materials delivered, and old items picked up, as close as possible to where they are used. Elimination Use lighter or smaller loads: order smaller bags and shorter lengths, and drain or break down old items before moving them. Substitution Use trolleys, pallet jacks, hoists, vacuum lifters or equipment instead of carrying by hand. Engineering Use a two-person lift for anything heavy, long or awkward. Plan the route first and clear it. Administrative Keep the load close, back straight and no twisting. Turn with your feet. Administrative	Medium
3	Cut treated timber with dust control and wash hands before eating	Saw cuts and kickback Wood and MDF dust Hazardous chemicals	High	Keep blade guards fitted and working, and use the riving knife on table saws. Engineering Use push sticks and clamps, and support long pieces so they do not pinch the blade. Engineering Use a sharp, undamaged blade made for the material. Administrative Stand to one side of the blade line, out of the kickback path. Administrative Let the blade stop fully before reaching in or putting the saw down. Administrative Buy pre-cut or pre-finished timber where you can. Substitution Cut outdoors or in a well-ventilated area away from others. Engineering (guarding) Use saws and sanders with dust collection connected to a HEPA vacuum. Engineering Clean up with a vacuum, not a broom or compressed air. Administrative Wear an N95 respirator for cutting and sanding. PPE Choose the least harmful product that does the job, for example water-based instead of solvent-based. Substitution Use chemicals in well-ventilated areas, or use fans and extraction in closed rooms. Engineering Read the Safety Data Sheet (SDS) and WHMIS labels before use. Workers have WHMIS training. Administrative Keep chemicals in labelled containers. Never decant into drink bottles. Administrative Store chemicals away from heat, food and drink, and keep products that react with each other apart. Administrative	Medium
4	Build bearers and joists, using edge protection if the deck is high	Falling from height Lifting and carrying heavy loads Structural collapse during alterations	Critical	Do the work from the ground where you can, for example pre-assemble on the ground or use extension poles. Elimination Install guardrails or edge protection on all open edges before work starts. Engineering (guarding) Use a scaffold, mobile work platform or aerial work platform instead of working off a ladder. Engineering Where edge protection is not practical, use a fall restraint or fall arrest system on a rated anchor point. Engineering Fall protection plan in place where required. Workers trained in fall protection (Working at Heights training in Ontario). Administrative Have a rescue plan so a worker hanging in a harness can be brought down within minutes. Administrative Rotate tasks and take breaks on long lifting jobs. Administrative Wear gloves for grip and safety boots to protect your feet. PPE Lifting and carrying heavy loads: see step 2 for the full controls Administrative Get an engineer to check before removing any wall, beam, post or bracing that may be load-bearing. Elimination Keep everyone clear of the area under and next to the work. Engineering (guarding) Install temporary props, needles or shoring as designed before removing any support. Engineering Follow the engineer's sequence. Do not change it without approval. Administrative Check props daily. Do not remove them until the permanent support is in and approved. Administrative	Medium
5	Lay and fix decking boards	Injury from power tools Nail gun injuries Repetitive work and awkward postures Sun exposure (UV)	High	Keep all guards fitted and working. Never tie back or remove a guard. Engineering Clamp or secure the work piece. Do not hold it by hand. Engineering Only trained, competent people use power tools, following the maker's instructions. Administrative Check tools before use. Unplug or remove the battery before changing blades or bits. Administrative Use a nail gun with a sequential (single shot) trigger, not a contact or bump trigger. Substitution Disconnect the air or battery before clearing jams, adjusting or moving between work areas. Engineering Keep your free hand at least 30 cm from the nailing point. Administrative Never point the gun at anyone or carry it with your finger on the trigger. Administrative Use tools that cut the effort: powered screwdrivers, long-handled tools and extension poles for overhead work. Substitution Set work up at waist height on benches or trestles where you can. Engineering Use light tools with good grips, and keep blades and bits sharp. Engineering Rotate tasks and take short breaks every hour on repetitive work. Administrative Plan outdoor work for early morning or late afternoon when UV is lower. Elimination Put shade covers over fixed work areas. Engineering Check the UV index each day. Use sun protection when it is 3 or higher. Administrative Check your skin regularly and see a doctor about any new or changing spots. Administrative	Medium
6	Fit railing before anyone uses the deck, then clean up	Falling from height Poor housekeeping and waste	Critical	Wear a full body harness with a shock-absorbing lanyard, clipped on at all times when using fall arrest. PPE Falling from height: see step 4 for the full controls Administrative Order materials to size and send packaging back where you can. Elimination Put waste bins and chutes close to the work. Engineering Clean as you go, and do a full clean up at the end of each day. Administrative Keep exits, stairs and walkways clear at all times. Administrative Stack materials neatly on level ground, away from edges. Administrative Wear gloves when handling waste. PPE	Medium

PPE

CSA green triangle safety boots (CSA Z195)Safety glasses (CSA Z94.3)Hearing protectionWork glovesN95 respiratorSun protection (sunscreen, hat, long sleeves)Chemical-resistant glovesSafety gogglesKnee padsRespirator fit tested to CSA Z94.4 (P100 for dust, or the type the air test calls for)Coveralls

Plant and equipment

Circular sawMitre sawPower drillNail gunHand tools

Emergency

Call 911. Add the nearest hospital, the muster point and the first aid attendant for your site.

Sign-off

Supervisor and every worker sign to confirm they have read and understood this FLHA, then sign off at the end of the shift.

Free FLHA template for deck building

Word (.docx) and PDF, Letter landscape, no email needed. Fill in your site details, then print or send it.

Word template (.docx)PDF template

Make yours in 2 minutes

Same document, filled in for your job. Answer a few yes or no questions, the crew signs on the phone, and you send the PDF.

Start this FLHA

Pre-start checklist for deck building

Tick these off before work starts. They come from the hazards, permits and equipment in this job.

FLHA read, explained and signed by everyone on the job
Guardrails or fall protection in place before anyone works at 3 m or more
Openings, voids and penetrations covered and marked
Locates valid and services marked
Weather checked: water, shade and rest breaks planned
First aid attendant, first aid kit and emergency number (911) confirmed
PPE checked and worn: CSA green triangle safety boots (CSA Z195), safety glasses (CSA Z94.3), hearing protection, work gloves

The safe sequence of work

Locate underground services before digging footings
Dig and pour footings, guarding open holes
Cut treated timber with dust control and wash hands before eating
Build bearers and joists, using edge protection if the deck is high
Lay and fix decking boards
Fit railing before anyone uses the deck, then clean up

Hazards to watch on deck building

The hazards most specific to this job, and the step where each one comes up.

Step 3Wood and MDF dustSawing and sanding timber, MDF and treated wood makes fine dust that causes asthma, skin problems and some cancers.

Step 5Nail gun injuriesA nail gun fires by accident, or a nail goes through the timber or ricochets and hits the user or someone nearby.

Step 5Sun exposure (UV)Long hours in the sun cause sunburn, eye damage and skin cancer.

Step 2Wet concrete and cement burnsWet concrete, mortar and cement burn skin and eyes. Burns can be deep and are often not felt until later.

Step 4Structural collapse during alterationsRemoving a wall, beam, post or bracing makes part of the building fall on workers.

Step 1Hitting underground servicesDigging, drilling or driving pegs hits a buried power cable, gas pipe or water main, causing electrocution, explosion or flooding.

Highest risk on deck building: Critical before controls (B), down to Medium after controls (A), on the Canada 5 by 5 risk matrix (likely and fatality becomes unlikely and serious injury).

What changes on your site

This example covers the job itself. Your site may add more. Add controls for any of these that apply (the builder asks you these as yes or no questions):

Could anyone fall 3 metres or more, or fall any distance into machinery, water, a hazardous substance or through an opening?
Will anyone use a ladder or stepladder?
Will anyone work on a roof?
Is there a fragile roof, skylight or clear roof sheet?
Will you use a scaffold or mobile tower?

Why FLHAs get rejected

Prime contractors and COR auditors send documents back for these reasons. This example avoids them, but check yours too.

End of shift boxes already say "None" when the form was signed at the start of the shift.
One FLHA reused for days or weeks, or a "review by" date a month away, when the work and conditions change daily.
No time of assessment and no record of any revision, which Alberta s.7(3) requires.
Workers signed that they "read" it, but nothing shows they took part, which Alberta s.8(1) requires.
Work at height with no fall protection plan where the province requires one, or no written rescue procedure for workers using fall arrest.
Permits or locates required on site but no permit or ticket numbers recorded.
No re-assessment entry after an obvious change such as weather, a new task or a new crew member.

Rules by province for deck building

Province or territory	Key local rule	Regulator
Ontario	Fall protection (O. Reg. 213/91 s.26) applies at a fall of more than 3 m, more than 1.2 m where the work area is used as a path for a wheelbarrow or similar equipment, and at any height into operating machinery, water or other liquid, a hazardous substance, or through an opening.	Ontario Ministry of Labour, Immigration, Training and Skills Development
British Columbia	Fall protection is required where a fall of 3 m or more may occur (s.11.2). A written fall protection plan is required at 7.5 m or more where there are no permanent guardrails (s.11.3).	WorkSafeBC
Alberta	A hazard assessment must be done before work begins, and before a new work site is built (OHS Code s.7(1)). The results must be written down with the controls (s.7(2)).	Alberta Occupational Health and Safety
Quebec	Guardrails (Safety Code s.2.9.1, as amended by Decret 63-2025) are needed where a worker could fall into liquid or a hazardous substance, onto moving parts or dangerous equipment, 1.2 m or more when using a vehicle, 1.5 m or more when handling a load, and more than 3 m in all other cases.	CNESST (Commission des normes, de l'equite, de la sante et de la securite du travail)
Manitoba	A prime contractor is required whenever more than one employer or self employed person works on the site at the same time (Act s.7).	Manitoba Workplace Safety and Health Branch
Saskatchewan	An occupational health committee is required at 10 or more workers of one employer (Act s.3-22).	Saskatchewan Ministry of Labour Relations and Workplace Safety, OHS Division
Nova Scotia	Workers must be trained in fall protection before using it or working in, supervising or planning work in a fall protection area, with a refresher at least every 3 years (WHSR s.21.19).	Nova Scotia Department of Labour, Skills and Immigration, Safety Branch (OHS)
New Brunswick	Fall protection is needed from 3 m above water or the nearest permanent safe level (Reg 91-191 s.49(1)(a)(i)).	WorkSafeNB
Newfoundland and Labrador	Give written notice to the minister before starting a construction project that will last 30 days or more, with the site, location, type of work and number of workers (Regs s.8).	Government Services, Occupational Health and Safety Division
Prince Edward Island	Fall protection is needed from 3 m above the nearest safe surface or water (Fall Protection Regulations s.2(1)(a)).	Workers Compensation Board of PEI, OHS Division
Yukon	Every employer must do hazard assessments with the committee, representative or workers, and redo them after significant changes or incidents (Regs s.1.03.01).	Yukon Workers' Safety and Compensation Board
Northwest Territories	Fall protection is needed from 3 m, or lower if there is a risk of injury (s.119(1)). Guardrails are needed for falls of 1.2 m to 3 m at permanent work sites (s.119(2)).	Workers' Safety and Compensation Commission (WSCC)
Nunavut	No 911. To reach the RCMP in an emergency, dial your community's first three digits then 1111 (Iqaluit: 979-1111). Put the local fire, ambulance and RCMP numbers on every FLHA.	Workers' Safety and Compensation Commission (WSCC)

Questions

Do I need an FLHA for deck building?

Who signs the FLHA?

The supervisor and every worker take part in the assessment and sign on before work starts, then sign off at the end of the shift. Review it and re-sign whenever the task or conditions change.

How long do I keep it?

Keep completed hazard assessments for at least 3 years (COR auditors sample the last 12 months). Review this FLHA and re-sign whenever the task, crew or conditions change.

What PPE is needed for deck building?

Usually CSA green triangle safety boots (CSA Z195), Safety glasses (CSA Z94.3), Hearing protection, Work gloves, N95 respirator, Sun protection (sunscreen, hat, long sleeves), Chemical-resistant gloves, Safety goggles, Knee pads, Respirator fit tested to CSA Z94.4 (P100 for dust, or the type the air test calls for), Coveralls. The site rules may add more, so check with the general contractor.

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Blank FLHA template: free FLHA templates. Also for other countries: Australia (SWMS) · United Kingdom (RAMS) · United States (JHA)