Roof Cover Over Shingles

Install a layer of roofing felt over the roof before you begin installing the new shingles.

Roof cover over shingles.

To level out an existing asphalt shingle roof rip down reduce the height of two courses of shingles as shown in the drawing below. The felt should be secured every six inches with nails or staples. Both metal and shingle roofs are great options for your next roofing project. Step 3 cover the old shingles.

Why installing new shingles over old shingles can be good. Things to know about metal over shingle roof problems. When contemplating a new roof many people hope to simply do a shingle over and avoid the extra cost and mess of tearing off the existing roof and starting from scratch. It s clearly easier and cheaper to leave the old shingles in place but there s some special prep work involved with a re roof removing vents ridge caps and misshapen shingles among other things and you still have to replace or add new flashing which sometimes can be tricky over old roofing.

Damaged shingles should be removed to check the decking for problems. Damaged decking will need to be repaired before you can install any new shingles. Let s start with the good. When you should tear off your roof and start from scratch instead.

Many arizona homeowners with shingle roofs do decide to roof over their existing shingles because. Although it sounds like a good idea we can assure you the cons heavily outweigh the pros. The first is running new underlayment over an existing shingle roof thus covering the old roof. Advantages of metal roofs over shingles.

Because asphalt shingles are routinely exposed 5 in rip down the first strip the starter course so that it is 5 in. Beveled wood pieces called horsefeathers must be laid along the thick edges of the shakes to make a fairly flat surface. When roofing over your existing shingles can be a good idea. Over time a metal roof without a.

This allows the new underlayment to act as a line of defense in the event that water somehow gets under the metal roof. If you are trying to decide between the two materials it s important to carefully look at the metal over shingle roof problems. Disadvantages of metal roofs. By placing metal roofing over shingles you can save in the labor costs of ripping them off while also preventing them from being thrown into landfills.

Metal roofs over shingles will also provide an extra layer covering your home helping to further insulate it. I have a 1949 1600 sf under roof with 8 12 pitches valleys and hips 2 6 rafters on 16 on center sheathed with 3 4 center matched lumber going over at least 1 layer of 3 tab shingles a partial tear took off the old tabs and left a nice wavy surface in pretty good shape. Asphalt shingles can be laid over cedar shakes or shingles however this is a roofing project best left to pros. The second benefit is that it acts as a buffer between the metal roof and the shingle roof.

Leave the old valley flashing in place and install new over it.