Attic flooring & loft boarding frequently asked questions.

Raised attic flooring over 300mm insulation costs €55 to €85 a m² supplied and fitted using 18mm P5 moisture-resistant tongue-and-groove chipboard on Loft Legs or timber counter-battens. Most homeowners book a complete package — an insulated folding attic stairs, hatch enlargement, LED light and 15 to 25 m² of raised flooring — which typically costs €950 to €2,400 inc. VAT. See our full attic flooring cost guide.

Yes — and you must never screw boards directly onto 100mm ceiling joists over 300mm mineral wool. Compressing mineral wool from 300mm down to 100mm cuts its thermal resistance (R-value) by more than 50% and traps condensation against the underside of the chipboard. Installers fit 175mm to 300mm polypropylene Loft Legs (or treated timber counter-battens) to support the T&G floor above the quilt with a ventilated air gap. See raised attic flooring over insulation.

An EN 14975 insulated 3-section folding timber attic stairs (such as a Stira, Fakro LWK Komfort or Dolle ClickFix) costs €350 to €650 supplied and fitted, including trimming or enlarging the ceiling hatch, fitting a draught-proof insulated trapdoor, architrave and a safety grab rail. Heavy-duty aluminium concertina stairs for narrow landings cost €520 to €850. See attic stairs installation.

Yes, for domestic loft storage. Modern prefabricated fink/W-truss roofs built in Ireland from the 1970s onwards are designed under Eurocode 5 / BS 5268 for a dead storage load of 25 kg/m² across the ceiling tie chord plus a 90 kg concentrated person load. Raised T&G boarding screwed to Loft Legs or cross-battens distributes weight evenly across multiple trusses. It is a storage deck, not a habitable bedroom conversion. See truss roof attic flooring.

If you claim the SEAI Better Energy Homes attic insulation grant (€1,300–€2,000), SEAI rules require the 300mm mineral wool (U-value 0.16 W/m²K) to remain uncompressed and the hatch to be insulated and draught-sealed. Boarding directly onto joists fails an SEAI inspection, whereas a raised deck installed above the full 300mm quilt with a breathable air gap preserves the 0.16 U-value and BER rating. See attic flooring & SEAI grants.

Almost every standard domestic job (an insulated folding attic stairs plus 15 to 25 m² of raised T&G boarding and an LED light) is completed in 4 to 7 hours on a single day. All panels are 1220×320mm loft boards carried cleanly through the hatch with dust sheets on your landing.

High-density polypropylene Loft Legs (175mm or 300mm XL, tested to 500kg per leg) are lighter on modern 35×75mm trussed rafters and create zero thermal bridging. Treated 150×44mm or 175×44mm timber counter-battens add rigidity on uneven older cut-roof joists or where heavy shelving is planned. See Loft Legs vs timber counter-battens.

One local attic flooring & loft boarding specialist covering your county. When you send the form, your details go to one specialist covering your county — never a directory of five competing callers. They confirm your joist depth, insulation thickness and hatch size and give you an itemised written quote.

A standard 3-bed semi-detached house in Ireland typically takes 15 m² to 20 m² of raised central loft boarding plus an insulated folding stairs and LED batten light. In 2026, that complete 1-day package costs between €1,350 and €2,100 supplied and fitted.

Yes — because attic boarding and folding loft ladders are permanent home improvements carried out where materials make up less than two-thirds of the total price, Irish Revenue's reduced 13.5% construction VAT rate applies rather than 23%.

No — provided the boarding is raised on Loft Legs or counter-battens so the full 300mm mineral wool layer remains uncompressed and a continuous ventilated air gap is maintained beneath the boards, your SEAI grant and post-works BER assessment are 100% protected.

Yes. The installer parts the top cross-layer of mineral wool along the joist lines, screws the Loft Legs directly into the timber ceiling joists, relays the wool snugly around each leg without gaps, and fixes the 18mm T&G deck on top.

If there are loose suitcases or boxes resting on the joists near the hatch, moving them to the eaves or onto the landing before the team arrives speeds up installation. The installers can help lift heavier items onto the new deck once the first bay is screwed down.

Yes. Most full-package teams wire the LED batten light into the upstairs lighting loop with a pull-cord or landing switch beside the hatch during the same 1-day visit.

A straightforward installation into an existing ceiling hatch takes 2 to 3 hours, including trimming the opening, squaring and bolting the casing, cutting the bottom leg angle to match your landing floor, and fitting the white architrave.

Yes. Older loose plywood hatches have a U-value of ~3.5 W/m²K and open gaps all around. A modern insulated attic stairs casing has a 36mm–86mm EPS/PU core (U-value 0.51–1.1 W/m²K) and continuous EPDM rubber seals that lock tight when closed.