By learning how to board a loft, you can not only drastically increase the storage potential of your loft, but also make it safer and more stable to move around in. This is especially useful if you are short of storage space in your home – the loft is often completely underused, so if you’re not planning on turning it into habitable space with a loft conversion, then adding loft boards and using it for effective storage can be a great solution.
Loft boards are fixed together relatively easily, but working withing the confines of the loft’s available space can make boarding a loft a tricky endeavour. Do heed the safety advice detailed below and only attempt the task if you are capable. If not, hire a professional.
If you want to board your loft, follow this step-by-step guide.
How to Board a Loft: Step-by-Step
You will need:
- Tape measure
- Jigsaw and workbench (if you need to cut the boards to size)
- Hooded Disposable Overalls
- Dust mask
- Screwdriver (ideally electric)
- Loft boards
- 38mm, number 8 screws/ 4x40mm screws
- Insulation material (optional)
Before you start:
- Don overalls, gloves and a dust mask for protection, and finish off with a pair of trainers to aid agility in the loft
- Set up a temporary work platform on a piece of board set across the ceiling joists — it is safer, and more comfortable, than trusting your balance
Step One: Measure Up
Measure the area you plan to board out (multiply the width of the loft by its length). Take measurements in metres, this makes it easier when you are buying boards.
Standard boards are commonly available in two sizes: 2,400 x 600mm and 1,220 x 320mm; and either 18 or 22mm thick. The larger boards are available from your local timber merchant and are the cheapest and easiest way to board a loft. The smaller boards are sold in DIY stores.
The 1,220 x 320mm boards come in packs of three and cover 1.17m² per pack. The 2,400 x 600mm boards are sold separately and cover 1.44m² each. Always add a 20% contingency on top of your final square metre figure to allow for awkward cuts.
Before you buy the boards, check the edges for damage. The tongues-and-grooves are vulnerable to clumsy handling, so be very picky when choosing.
Step Two: Assess the Insulation
Before you start laying boards, check the depth of your insulation. Building Regulations guidelines recommend a minimum 270mm thickness of insulation blanket. But joists are usually no more than 100mm deep, so this would be impossible to achieve and still put a floor on top. Furthermore, squashing insulation down to fit joist height is a bad idea as this halves it’s effectiveness — doubling your heat loss.
The best solution is to build a raised loft floor above the insulation (details of which are shown below). You can still board directly on to the joists if you want, but it is worth noting that this would not pass a building control inspection, because you wouldn’t have the full 270mm depth of insulation required by regulations. Whatever you do, make sure you put as much insulation beneath the boards as possible.
(Do note that if you board directly on to the joists, you run the risk of causing interstitial condensation. This is where moisture condenses on the underside of the boards and drips down, causing damp. To avoid this you need to raise the boards up and permit a flow of air between the insulation and the boards. Only board directly on to the joists if you know there is no risk of condensation forming in your loft).
Step Three: Lay the First Board
If you intend to board directly on to the joists instead of having a raise floor, then start by placing the first board across the joists.
If the board overhangs mark it at the centre of the last joist it crosses and make a straight cut at this point with a jigsaw. This allows the board that will butt up to its end to be supported by the joist.
Step Four: Stagger the Joins
For maximum strength the boards must be laid in a staggered pattern, in such a way that neighbouring joins do not line up. Lay a full board next to the first one and then mark or measure if it needs to be cut (SEE STEP 3).
Step Five: Fix in Place
Cut the second board (if necessary) and slide it into position with the first board, making sure the tongue-and-groove is fully connected to form an almost invisible join. Fix with two or three screws along the join.
Step Six: Fill in the Gaps
Measure, cut and fit infill pieces as you go to complete the run of boards. Slide them into position with gloved hands (the cut edges can be sharp).
Lay a block of wood along the outer edge of the board and tap it with a hammer if the tongue-and-groove connection creates too much resistance. This method prevents damage to the vulnerable board edges.
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Things to note
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A raised floor is the quickest and easiest way of creating a storage area over the required depth of insulation. Moreover, it is the best option if you have light fittings and wiring in the loft, and it also eliminates the time spent cutting loft boards to size.
You can use products such as Loft Legs to raise the boarding above the insulation.
Loft Legs are simple, inexpensive plastic supports that are secured to the ceiling joists or roof trusses. Insulation is installed around the Loft Legs and loft boards are screwed directly onto the top of the legs. The resulting raised floor is extremely strong and the floor can be installed quickly with basic DIY skills.
1) Screw legs to joists/trusses 2) Lay insulation 3) Screw down loft boards
Not only is this very strong, but it also allows you to span over awkward joists.
Find out more about creating loft storage here.