At eaves, wall insulation should be continued between the rafters until it butts the underside of the Mannok Therm Roof / MR boards. To limit heat loss and prevent problems such as condensation, mould growth and staining occurring at cold spots in the construction, insulation should be continuous at junctions between the roof and other elements, particularly the eaves and gable. The boards should be pushed right into the space so they are tight up against the battens.ĥ. Fit the cut Mannok Therm Roof / MR insulation boards tightly between the rafters, with the Mannok branded side facing into the building. Measure the space between the rafters where the insulation will be placed and cut the insulation boards marginally wider than the space to ensure a friction fit upon installation.Ĥ. For a ventilated roof, fix battens on the inside of the rafters 50mm from the underlay to leave vented air spaces.ģ. For obvious reasons, this solution is not recommended for those whose garages have particularly high (or cathedral) ceilings. Insulation is then installed on the exterior facing side of this ceiling. For a ventilated roof structure, a traditional high resistance sarking can be used.Ģ. A finished ceiling is most often accomplished by installing drywall or a tongue and groove system to the underside of your garage’s joists. For an un-ventilated roof construction, a vapour open underlay or breather membrane should be specified. Mannok Therm Laminate-Kraft / MLK PIR Insulation has a kraft paper facing on one side and plasterboard bonded to the other side, making it ideal for use below the rafters to reduce heat loss through the roof and eliminate thermal bridging through the rafters.ġ. Mannok Therm Roof / MR Insulation boards are faced on both sides with a low emissivity composite foil facing, which increases the insulation’s thermal resistance to adjacent unventilated air space, improving the roof’s overall thermal performance. The rafters themselves will allow more heat loss than the insulation material, so the layer of insulation installed beneath the rafters is essential to combatting this thermal bridging effect.įor this method of pitched roof insulation, we recommend using Mannok Therm Roof / MR Insulation boards between the rafters and Mannok Therm Laminate-Kraft / MLK Insulation boards below the rafters.īoth products are high performance PIR insulation boards which have been specifically designed for this type of roof construction. This method of installing roof insulation allows you to maximise the headroom by using a thinner layer of insulation beneath the rafters, whilst achieving U-Values which will ensure you comply with Building Regulations and have a roof space or loft which is comfortable for its occupants. Insulating a pitched roof between and below the rafters is a very common roof insulation choice, particularly for retrofit and refurbishment projects.
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