You can t do it with wood or slate for example and you should never mix materials such as laying asphalt shingles over cedar shakes.
Roofing over old roof.
In fact the only pro to a shingle over is it s cheaper and cleaner.
Adding new roofing over old sometimes called a re roof is possible only with asphalt shingles also called composition shingles.
Sometimes they use a standard gardener s potato fork but the best tool for the job is a red ripper integrated roofing technologies 2413 stevenage dr unit 11.
Roofing over your old roof can save you around 1 000 on installation costs because the roofing company won t have to remove and dispose of old shingles.
I ll explain why later.
When roofing over your existing shingles can be a good idea.
But before we get started one thing must be clear.
Beveled wood pieces called horsefeathers must be laid along the thick edges of the shakes to make a fairly flat surface.
Why installing new shingles over old shingles can be good.
Although it sounds like a good idea we can assure you the cons heavily outweigh the pros.
Installing a new roof over an existing one also called a layover or nailover is often possible although not always the best option.
Many arizona homeowners with shingle roofs do decide to roof over their existing shingles because.
The roofing crew uses a red ripper roofing demolition tool to pry up cap shingles which are collected in a plastic bin along with old boot flanges and any loose shingle tabs.
When you should tear off your roof and start from scratch instead.
You can save.
Let s start with the good.
It can save you money at the time but it might actually end up costing you more in the long run.
Asphalt shingles can be laid over cedar shakes or shingles however this is a roofing project best left to pros.
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.