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4 Posts
I would do a complete tear off.
To add your decking, then your felt then shingles....the double weight alone would give me pause. Another reason for the tear off is there is give in the shingles...so going over them will not give you a good solid base ( deck).
Also what's to say there is anything wrong with the decking that's there. You might not even have to put up new decking...saving money is always good.
Depending on how bad the shingles are on there now and how many layers there are you might have to replace the underlay anyway and again to go over already compromised decking.....not good at all.
To add your decking, then your felt then shingles....the double weight alone would give me pause. Another reason for the tear off is there is give in the shingles...so going over them will not give you a good solid base ( deck).
Also what's to say there is anything wrong with the decking that's there. You might not even have to put up new decking...saving money is always good.
Depending on how bad the shingles are on there now and how many layers there are you might have to replace the underlay anyway and again to go over already compromised decking.....not good at all.