In the case of spray foam insulation it is applied to the roof rafters balancing the temperature in the loft with the rest of the house.
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Poor ventilation equals condensation.
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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.
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It is made by mixing and reacting unique liquid components at the job site to create foam.
This minimises the issue of cold air meeting warm air.
2 increases the insulation in a roof and protects water tanks and pipes from freezing.
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.
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3 it creates a dry clean useful loft space.
However there are still some issues with spray foam insulation on the roof that can be avoided.