1 the spray on foam salesman s pitch goes something along the lines of that the spray foam stops tiles and slates from slipping and strengthens the roof by holding them in place.
Spray foam insulation slate roof.
Moisture generated indoors or that infiltrates into the home is responsible for the bulk of the moisture in an attic insulated with spray foam on the underside of the roof sheathing.
2 increases the insulation in a roof and protects water tanks and pipes from freezing.
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Spray foam insulation is a better insulator than mineral wool loft insulation as you need less of it to get the same insulating effect.
Some spray foam insulation sets rigid and can also be used to help reinforce roofs that are suffering from nail fatigue when the nails used to hold slates in place rust or support cavity walls where the wall ties are failing causing cracks and bulges in walls.
Spray foam also acts as a sound barrier muting and reducing outside noises.
The main areas of concern are that replacement of the roof in the future will be a more costly and time consuming job and the slates cannot be reused.
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You may also loose ventilation and the roof structure can then suffer from condensation.
We specialise in a range of different roofing services to fit your individual needs.
It s not coming from above the roof and it s not some new moisture source resulting from the spray foam.
Overall spray foam insulation when used on a slate roof will ensure it lasts longer and will provide additional structural support.
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You would first have to create a vent channel under the slates by installing 1x1 sticks at the top of each rafter bay followed by stiff material like rigid foam or plywood.
If you want to insulate the sloping roof you definitely don t want to install spray foam against the back side of the slates.
At foamroof our own employed team of roofing experts can solve your roof repairs and install spray foam loft insulation for you and households in southern england.