Apart from the problems going unnoticed during the actual shingle over there are long term effects to consider as well.
Shingling a shed roof over old shingles.
All shingle manufacturers honor the warranty whether their products are used for a reroof or a new roof.
Asphalt shingles can be laid over cedar shakes or shingles however this is a roofing project best left to pros.
Looks just as good and lasts as long.
Take care where you discard the existing materials for the time being and make sure to get rid of them properly later.
How to shingle over existing shingles and how to shingle a roof how to install roof shingles shingle layout lines h.
Adding new roofing over old sometimes called a re roof is possible only with asphalt shingles also called composition shingles.
Has the same manufacturer s warranty.
For instance instead of just one roof on your home you now basically have two.
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.
That s a lot of extra weight putting added stress on the roof decking.
Place the ridge cap shingles over the roof ridges.
Before you reshingle a roof read our step by step guide for adding new shingles over old ones.
Nail each side of the cap shingle into the roof.
Installing a new roof over shingles takes less time than tearing off the old roof.
Damaged decking will need to be repaired before you can install any new shingles.
Place and nail the shingles from the bottom of the roof to the top.
Install a layer of roofing felt over the roof before you begin installing the new shingles.
The cap of each shingle should fall evenly in half over each side of the ridge.
Beveled wood pieces called horsefeathers must be laid along the thick edges of the shakes to make a fairly flat surface.
As long as it s done right and under the right conditions installing new shingles over old ones can last as long and look just as good as a complete re roof.
Long term effects of shingling over shingles.
Manufacturers will still.
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.
Use a fork to work the edges lose and then begin to strip them off with a shovel.
Damaged shingles should be removed to check the decking for problems.
Step 1 strip old roofing materials.
If this is an old shed you will need to remove the existing shingles before you can lay the new stuff.
Roofing second layer of shingles roofing.
The felt should be secured every six inches with nails or staples.
