Project · Single Ply Membrane

Care Home, 8 Old Castle Road

A 200m² main warm roof, three warm roof dormers and a 50m² rear first floor roof for a care home in Salisbury, all in Alwitra 1.2mm VSK single ply.

Location

Salisbury, SP1 3SF

Property type

Care home

System

Alwitra 1.2mm VSK single ply

Scope

200m² main roof, 3 x 5m² dormers, 50m² rear roof

The Project

Three Roof Areas at a Salisbury Care Home

The 200m² main warm roof was insulated with 200mm tissue-faced insulation to achieve a 0.11 U-value. The build-up starts with a Visqueen Vapour Check VCL to remove the risk of interstitial condensation within the structure. The 200mm insulation boards were mechanically fixed to the 18mm plywood substrate using 75mm insulated tubes and carbon fibre fixings, and Alwitra 1.2mm VSK single ply membrane was fully adhered to the boards.

The three 5m² warm roof dormers follow the same build-up with 150mm tissue-faced insulation to achieve a 0.15 U-value, again with Alwitra 1.2mm VSK fully adhered to the insulation and lead profiles fully heat-welded to the membrane.

On the 50m² rear first floor roof, the Alwitra VSK membrane was fully adhered straight to the 18mm plywood substrate. The terrace was finished with perimeter drop-down gutters and 70mm S-Type Alwitra flange outlets into designated outlets.

Visqueen Vapour Check VCL to remove the risk of interstitial condensation

200mm tissue-faced insulation for a 0.11 U-value on the main roof; 150mm for 0.15 on the dormers

Boards mechanically fixed with 75mm insulated tubes and carbon fibre fixings to 18mm plywood

Lead profiles heat-welded to the membrane; 70mm S-Type Alwitra flange outlets on the terrace