Question 1

1. How strong are standard loft boards?

Accepted Answer

Standard 18mm chipboard loft boards are suitable for light storage and occasional access when fixed across ceiling joists. For everyday use or heavier loads however, you’ll need a floor built for regular use, with stronger boards and support.

Question 2

2. Can I lay loft boarding directly over insulation?

Accepted Answer

No. Mineral wool insulation works by trapping air, so squashing it down with boarding reduces its thermal performance, leading to heat loss through the ceiling. Doing this can also restrict ventilation, increasing condensation risk.

In most UK homes, recommended insulation depth is around 270mm. Standard joists are usually shallower than this, so boarding that’s laid directly over the insulation will flatten it.
In situations like this, you can use a raised loft flooring system to keep boards above insulation. This protects both energy efficiency and airflow in the loft space.

Question 3

3. Do I need moisture-resistant loft boarding?

Accepted Answer

You usually only need moisture-resistant loft boards if the roof space has poor ventilation, elevated humidity, or a known risk of condensation. These boards are typically made from chipboard treated with a moisture-repellent resin, helping prevent swelling, warping, or surface breakdown in damp conditions.

They’re commonly used in older properties with limited airflow or where insulation has reduced natural ventilation paths. Moisture-resistant options are also useful in coastal areas, cold roof designs, or where roof coverings are prone to minor leaks. In well-ventilated lofts with dry conditions, standard boards are usually sufficient.

Question 4

4. What’s the difference between loft boards and attic boards?

Accepted Answer

Both terms are used interchangeably in the UK. ‘Attic boards’ is more common in older homes or among retrofit trades, but the products are the same.

Question 5

5. What are loft crawl boards?

Accepted Answer

Loft crawl boards are short timber planks or panels placed to allow safe movement across joists without fully boarding the loft. Common in retrofit or inspection scenarios.

Question 6

6. How much does it cost to board a loft?

Accepted Answer

Loft boarding costs vary depending on board type, coverage area, and installation conditions. Standard chipboard panels are most cost-effective, but moisture-resistant or raised systems cost more.

Labour costs increase when you need raised platforms, or where loft access is restricted. A fully boarded loft typically costs more than partial or walkway-only installations. Additional time may be needed to work around wiring, obstructions, or ventilation. For accurate pricing, request an itemised quote covering materials, labour, and any extras needed for the specific site.

Question 7

7. Where can I find the cheapest loft boards in the UK?

Accepted Answer

If you’re looking to save on loft board costs in the UK, you’ll need to shop around to find the best supplier prices. Buildbuddy can show you the cheapest loft boards currently available, with retailer prices all in one place.

Loft boards

Chipboard Loft Panels - 18mm Loft Boards - T&G 1220mm x 320mm - Pack of 3

Forgefix Loft Ledge 530mm x 530mm

Forgefix Loft Light 125mm x 110mm x 80mm

OSB 3 Loft panel (L)1.22m (W)0.3m (T)18mm , Pack of 3