165mm Insulation Board At Wholesale Prices

165mm Insulation Board

A 165mm insulation board is designed to reduce heat loss. You will often find this thickness in new builds, large extensions, and upgrade work. It helps improve energy efficiency and support compliance with UK Building Regulations Part L, depending on the full build-up and calculation.

What is a 165mm thick insulation board?

The 165mm thick insulation board is made using high-performance insulating materials, commonly PIR or phenolic foam. The material traps low-conductivity gases within its closed-cell structure, which restricts free heat movement. Thermal resistance increases because heat must travel through a greater thickness of low-conductivity material.

The panel itself is factory-produced to a consistent depth of 165mm. That accuracy matters on site because uneven thickness can lead to a poor fit and reduce thermal performance, even where the calculated U-values appear compliant.

What is the thick 165mm insulation board used for?

A 165mm insulation thickness board is used where space allows and thermal targets are demanding. Final installation depends on structural constraints and detailing requirements:

Floors – Used above concrete slabs or between joists where depth is available. On ground floors, this thickness significantly reduces heat loss into the ground and helps limit edge heat loss when perimeter detailing is correct.
Pitched roofs (ceilings and rafters) – Often fitted between and below rafters. This depth may help achieve target roof U-values within some build-ups. Ventilation gaps and correct vapour control remain critical at this thickness.
Walls – May be used in wide-cavity wall systems where the full wall design allows.. It’s also used internally where external insulation is not possible.
Framing walls – In timber or metal stud walls, boards can be fixed internally over studs or combined with between-stud insulation to control both heat loss and condensation risk.
Internal masonry walls – Used as insulated dry lining where solid walls need upgrading. The thickness delivers good thermal improvement but requires careful detailing around reveals and services.

At Insulation Wholesale, you can purchase 165mm Insulation Board at low wholesale prices with fast delivery for most of items within 2-5 days. Competitive rates guaranteed.

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165mm Celotex XR4165 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) Pack of 12

165mm XR4165 is a polyisocyanurate (PIR) insulation core with composite aluminium foil facings on both sides. Celotex is a multi-purpose insulation board suitable for use in pitched roofs, ceilings, floors and walls.

£1,111.45£1,333.74 Ex VATInc VAT
£32.16£38.59 Per M2
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165mm Unilin Thin-R PIR Insulation Board 2400mm x 1200mm (8′ x 4′) Pallet of 14 (40.32m2)

165mm Unilin Thin-R PIR insulation is a foil faced, high-performance insulation solution that offers exceptional thermal efficiency and durability. This polyisocyanurate insulation board, formerly known as Xtratherm, is ideal for a range of applications, such as floors, pitched roofs, and walls.

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