In a warm pitched roof ( insulation over rafters ) the weight of the tiles or slates is taken by the counter battens. In above - rafter insulation , the insulation is laid completely across the rafters and provides the highest quality insulation for your roof. In contrast to thermal insulation between the rafters , with the over - rafter.
The roof structure for this application is usually carried out as follows: Used as . Celotex is the brand leading manufacturer of PIR insulation boards, with its range.
High performance PIR insulation boards for use between and over rafters. Our PIR insulation will create a warm and habitable roof space, without the need to . For above - rafter insulation , the most effective building insulation metho a sealed cover made of insulation panels is laid is over the entire roof area and . The EST target u-value for the rafter -level insulation of a pitched roof is 0. Insulation attached over the rafters reduces thermal bridging. No need to join boards on rafter line due to.
U–value tables for pitched roofs with rafters at different centres.
Over rafter insulation with LR underlay.