Timber Floors Fitted
Wooden Flooring Installation Belfast
A timber floor is only as good as what is under it and how long it sat in the room first. CSW fits solid and engineered flooring in Belfast without skipping either.
The Two Things That Ruin Timber Floors
Almost every failed wooden floor we are asked to look at failed for one of two reasons, and neither of them is the quality of the boards. Either the subfloor was not right, uneven, damp or moving, and the new floor faithfully reproduced every one of those problems, or the timber was laid the week it arrived and then shrank or cupped as it came into balance with the room.
Both are entirely avoidable and both cost time rather than money. Checking and preparing the subfloor is a day's work. Letting timber acclimatise in the room where it will live is a week of doing nothing, which is the hardest thing to sell to somebody who wants their house back. It is also the difference between gaps opening across every board in the first winter and a floor that stays tight.
Belfast adds its own wrinkle. A lot of the housing stock is suspended timber ground floors over a ventilated void, which behaves quite differently from a concrete slab, and a lot of it has had damp issues at some point. Establishing what you are laying onto is the first job, not the last.
Solid Timber
Traditional solid boards, oak, ash or walnut, secret nailed or glued depending on the subfloor. Can be sanded and refinished several times over a very long life, and moves more with humidity.
Engineered Timber
A real timber wear layer on a stable plywood core. Far more dimensionally stable, which makes it the sensible choice over underfloor heating or on a concrete slab, and it still sands back once or twice.
Subfloor Preparation And Repair
Levelling, replacing failed boards, addressing squeaks and movement, dealing with damp before it is covered up, and getting a flat, dry, sound base to work from.
Why CSW For Flooring
We Check Underneath First
Level, moisture and movement measured before anything is ordered. A floor laid over a problem becomes a more expensive version of that problem.
Acclimatisation Is Not Optional
Timber sits in the room it will live in before it goes down. It is the least glamorous part of the job and the one that prevents gaps.
Joiners Doing Joinery
Thresholds, reveals, scribing round chimney breasts and undercutting architraves. The edges are what separate a fitted floor from a laid one.
Honest On Underfloor Heating
Not every timber suits it. We will tell you which does and what board width to stay under rather than fitting whatever you have bought.
Builders Too
If the subfloor needs real repair, or damp needs dealing with properly first, that is our work rather than a reason to walk away from the job.
Skirting Handled Properly
Because we make matched mouldings, skirting can come off and go back rather than being covered with a beading strip round the whole room.
Flooring, Building Control And Certification
Laying a floor covering is not usually notifiable work, but a few things that happen at the same time are, and one of them works differently in Northern Ireland from the rest of the United Kingdom. This is general guidance and your district council's building control service is the authority on your particular job.
The Floor Itself Is Rarely Notifiable
Replacing a floor covering in an existing room is not generally a building control matter. Building control in Northern Ireland is administered by your district council under the Building Regulations (Northern Ireland) 2012, and there is no private approved inspector route here, but for most flooring work there is nothing to apply for.
It changes when the floor structure itself changes rather than the surface. Replacing failed joists, altering the ventilation to a suspended timber void, or building up a floor level as part of a conversion are all more than a covering.
- A new covering over a sound existing structure is not notifiable.
- Replacing structural joists is a different matter and worth a call to the council.
- A Building Notice can only be used for minor planned work to a single domestic property, so anything structural is a Full Plans question.
Electric Underfloor Heating And Certification
If electric underfloor heating is going in under the timber, the point worth knowing is that Part P does not apply in Northern Ireland and there are currently no statutory requirements for domestic electrical installation work here.
So nobody is legally obliged to certify the heating circuit, the thermostat or the connection back to the consumer unit. Once a timber floor is down over it, that installation is permanently inaccessible, which makes the certificate more valuable than usual rather than less.
- Ask for the electrician's registration and an installation certificate before the floor covers the mat.
- Get any commissioning and resistance test results in writing at the same time.
- In a privately rented property, The Electrical Safety Standards for Private Tenancies Regulations (Northern Ireland) 2024 apply separately.
Suspended Floors, Ventilation And Damp
A great many Belfast houses have a suspended timber ground floor over a ventilated void, and that ventilation is doing a job. Airbricks blocked by a raised patio, a new path or years of soil build up are a common cause of damp and rot in the joists underneath.
Fixing that is worth doing before laying anything on top, because the new floor will hide it. Where the ground outside has been raised against the wall, that is a landscaping problem showing up as a flooring problem.
- Check the airbricks from outside before covering the floor from inside.
- Never seal a ventilated void with an impermeable covering without understanding what that does to the joists.
- A moisture reading in the subfloor takes two minutes and settles the argument.
How A Timber Floor Is Fitted Properly
Reading The Subfloor
Before anything is ordered we find out what we are laying onto. Concrete slab or suspended timber, how flat it is over a two metre straight edge, whether it moves underfoot, and what a moisture meter says. On a slab the moisture reading is decisive, because a screed that is still giving up water will destroy a solid timber floor.
Flatness is not the same as level. A floor can slope noticeably in an old house and be perfectly fine to lay on, while a level floor with a dip in the middle of a room is not. It is the local variation that causes hollow spots and creaking.
Acclimatisation, The Part Everyone Skips
Timber is hygroscopic. It takes up and gives off moisture until it balances with the air around it, and it changes dimension as it does. Boards delivered from a cold warehouse into a heated Belfast living room will move, and if they are already nailed down when they move, they gap or cup.
So the packs come into the room where the floor is going, get opened, and sit there. It feels like nothing is happening. It is the single most effective thing you can do to prevent gaps opening up across the whole floor in the first heating season.
Solid Or Engineered, Honestly
Solid timber is the traditional choice and it will outlive everyone if looked after, because it can be sanded back several times. It also moves the most with humidity, which makes it a poor match for underfloor heating and a risky one over a slab that is not fully dry.
Engineered board is a real timber wear layer on a cross bonded core, so it barely moves. That stability is why it is the right answer over underfloor heating and generally the right answer on ground floor concrete. It is not a compromise product, it is a different tool, and we will say which one your room actually wants.
Edges, Thresholds And Expansion
The edges are where a fitted floor is distinguished from a laid one. Architraves undercut so the board runs beneath them rather than being scribed awkwardly around them, chimney breasts followed cleanly, thresholds made rather than bought as a strip.
Every timber floor needs an expansion gap at the perimeter, and the honest options are to hide it behind skirting that comes off and goes back, or behind beading. Removing and refitting the skirting looks far better, and because we make matched mouldings we can replace anything that does not survive the removal.
How A Flooring Job Runs
Survey The Subfloor
Type, flatness over a straight edge, movement and a moisture reading. On a slab that reading decides what timber is safe to use.
Check The Ventilation
On a suspended floor we look at the airbricks from outside. Blocked ventilation is a common Belfast problem and it must be sorted before it gets covered.
Choose Solid Or Engineered
Driven by the subfloor and by whether there is underfloor heating, not by preference alone. We will give you a straight recommendation.
Deliver And Acclimatise
Packs into the room, opened, and left. Nothing appears to happen for several days and it is the step that prevents gapping later.
Prepare And Lay
Levelling and repair where needed, then laid by the method the subfloor calls for, with perimeter expansion gaps set correctly all round.
Edges And Finish
Architraves undercut, thresholds made, skirting refitted or beading applied, and the floor cleaned and protected before we hand the room back.
Frequently Asked Questions
Why do wooden floors develop gaps in winter?
Almost always because the timber was laid before it had acclimatised. Boards take up and give off moisture until they balance with the room air, and they change dimension as they do it. Delivered from a cold store into a heated Belfast living room and nailed down the same week, they shrink and gap across the whole floor.
How long does timber need to sit in the room first?
Several days at minimum, in the actual room where it is going, with the packs opened and the heating at its normal setting. It feels like wasted time because visibly nothing happens. It is the single most effective thing you can do to stop the floor gapping or cupping in its first heating season.
Solid or engineered timber?
Depends on what is underneath. Solid can be sanded back several times and will outlive everyone, but it moves most with humidity, which makes it a poor match for underfloor heating or a slab that is not fully dry. Engineered has a real timber wear layer on a stable core and barely moves. It is a different tool, not a compromise.
Can I have a timber floor over underfloor heating?
Yes, with the right timber and the right board width. Engineered board is the sensible answer because it is dimensionally stable. Solid timber over underfloor heating is asking for movement. We will tell you what will work rather than fitting whatever has already been bought, which is a conversation better had before ordering.
Does laying a wooden floor need building control approval?
Replacing a floor covering in an existing room is not generally notifiable. It becomes a building control question when the structure changes rather than the surface, for example replacing failed joists or building up a floor level as part of a conversion. Building control in Northern Ireland is your district council, with no private inspector route.
Will you certify electric underfloor heating?
Ask for it explicitly, and get it before the floor goes down. Part P does not apply in Northern Ireland and there are currently no statutory requirements for domestic electrical installation work here, so nobody is obliged to certify the mat, thermostat or connection. Once timber is over it, that installation is permanently inaccessible.
My floor is not level. Is that a problem?
Not necessarily. Flatness and level are different things. An old Belfast house can slope noticeably across a room and still be perfectly fine to lay on. What causes trouble is local variation, a dip or a hump over a short distance, because that is what produces hollow spots and creaking underfoot.
What about the airbricks under a suspended floor?
Check them before you cover anything. A great many Belfast houses have a suspended timber ground floor over a ventilated void, and airbricks blocked by a raised patio, a new path or years of soil build up cause damp and rot in the joists. It presents as a flooring problem and it is actually a landscaping one.
Do you take the skirting off or use beading?
Every timber floor needs a perimeter expansion gap and it has to be hidden somehow. Taking the skirting off and putting it back looks far better than running beading round the whole room. Because we make matched mouldings, anything that does not survive removal can be replaced to the same profile.
Can an existing old floor be saved instead of replaced?
Often, and it is worth asking before ordering new. Original Belfast pine floorboards are usually better timber than anything you can buy now. Where boards are sound, lifting, repairing the bad ones, refixing to stop movement and sanding back gives you a floor with a history for less than a new one.
More Joinery & Carpentry From CSW
Get Your Free Quote Today!
Before you order anything, let us take a look at what is under the existing floor. A moisture reading and a straight edge take ten minutes and they decide what timber is actually safe to lay. No charge for the visit.
- Call us: 07703 433214
- Email: Cswbuild@gmail.com
- Location: Belfast, Northern Ireland