This article discusses how to prepare an existing asphalt shingle roof for a roof over or for re roofing with new asphalt shingles.
Reroof over existing flat roof.
Roofing over an existing roof is also called reroofing or an overlay.
It is the process where roofers install a new roof over your existing one i e.
Installing a new roof over an existing one also called a layover or nailover is often possible although not always the best option.
Before you reshingle a roof read our step by step guide for adding new shingles over old ones.
There are a few situations where roofing over an existing roof just isn t possible.
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Transmits roof loads directly to the building s structure and does not rely on the existing roof system s for support.
Nailing new shingles over existing ones is less expensive and faster requiring less labor but it also means you lose the chance to assess the sheathing for signs of water damage.
Difference between reroofing and roof replacement.
How to install a roof over an existing roof.
Because there is no tear off reroofing can go much faster and be much less expensive than a complete roof replacement.
We also discuss proper asphalt shingle roof preparation for a roofover job.
Also the application of a new roof coating over an existing spray polyurethane foam spf roof system is permitted without removal of the existing spf roof system and any under lying roof system.
This article series discusses best practices in the selection and installation of residential roofing.
Asphalt shingles can be laid over cedar shakes or shingles however this is a roofing project best left to pros.
The only way to know for sure whether it will work for you is to ask a professional roofer.
Asphalt roof shingle re roofing advice.
It can only be done once so if you already have two layers of roofing in place reroofing is not an option for you.
If the job is done correctly with the new layer of shingles laid flat over the existing shingles the old roof cushions the new one and serves as a secondary barrier should wind or water ever break through the new shingles.
Reroofing is the process of layering one set of new shingles over a set of existing shingles.
In this video i take show how to proper recover an old roof and make it look like it s a single layer check it out you might find useful tips for your new.
All shingle manufacturers honor the warranty whether their products are used for a reroof or a new roof.
Beveled wood pieces called horsefeathers must be laid along the thick edges of the shakes to make a fairly flat surface.
Add a new layer of shingles which means that there is no tearing off of the old roof.
