If you use spray foam the slates can not be re used when re roofing.
Spray foam slate roof.
Pros of spray foam for slate roofs spray foam does an excellent job of protecting the slate tiles on your roof and strengthening them.
Closed cell foam has a higher r value per inch and installers generally spray 2 in walls and 3 in roof lines to meet the energy code requirements of r 13 and r 19 respectively.
It is also quickly installed virtually leak proof and self flashing.
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Any tiles that are starting to fail will be given a few more years of life by having this additional structural element added to their underside.
You may also loose ventilation and the roof structure can then suffer from condensation.
The insulation may also have poor.
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The foam will also contract and expand depending on the weather which again reduces cracks.
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.
Spray foam roofing spray foam roofing is becoming more and more popular as a flat roof solution.
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With a spray on roof you can fill gaps seams and cracks in your existing roof construction giving you even more protection.
Spray on roofs can also be levelled out more easily reducing the collection of water in ponds.
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3 it creates a dry clean useful loft space.
In retrofit or re roof applications the foam can be applied directly to the existing roof in many cases.
It doesn t fill the cavity though so spot checks may be required to check you don t get shorted.
Spray foam is a great fit for both new construction and retrofit applications.