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In this instance you need to make sure that you have at least a 50mm gap between any insulation between the rafters and the underside of the felt. You will also need to ventilate at eaves and ridge level to ensure there is enough air movement to carry away any moisture. The rest of the insulation is then fixed below the rafters as necessary to achieve the correct U-value.
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Back to Earth is a natural building material supplier. We're not your typical builders' merchant though and instead work closely with our clients during the planning, designing and building phases of projects.
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