The Dyrt: Plywood Over Old Roof

Saturday, May 4, 2019

Plywood Over Old Roof

It is relatively common practice to lay new sheathing over old but I dont like it and whenever we are faced with this we remove the old and install the new. Sheet with varying thickness.

Redecking Entire Roof With New 1 2 Plywood Over Existing 3 8 Plywood In Bad Condition Roof Roof Deck Wood

It can withstand moisture for a brief period of time but may become warped.

Plywood over old roof. Well here is one way to figure it out. With shrinkage of 5-10 percent gaps of another a half-inch begin appearing all over your roof. Check Out Plywood On eBay.

Another concern is that the roof will have added weight if new plywood is installed without removing the old. As long as the new plywood itself can span the distance and carry the roof wind seismic and snow loads for your region adding new ply over old is just fine. How do you know if your home has board sheathing.

Over time shiplap fir wood resin dissipates causing the boards to shrink crack form knot holes and become extremely brittle. Most construction sites will consider the use of either OSB or plywood for the roof. Roofing - put plywood over existing 38 plywood.

Required Dimensions of Plywood for Roofing. Open spaces form between the once tightly-fitted shiplap boards. Annonse Looking For Great Deals On Plywood.

From Everything To The Very Thing. I am using a 716 OSB Sheathing that I got from Lowes. This will ensure that the strength of the plywood is enough to bridge spots on the roof where the old plywood was weakened to the point that it would sag under the load on the roof.

Some contractors who desperately want your business may lure you in with promises of big savings if you agree to go for one or both of these options. There is one more type of plywood that has been known to be used in roofing which is Fire-Retardant Plywood or FRT Plywood. These 8 to 12-inch wide boards were nailed together tight.

The new plywood thickness should be at least equal to the exusting plywood thickness. I am thinking of having an additional layer of plywood or osb added to the roof. When you think of a modern plywood roof deck youre not imagining gaps between the sheets of plywood.

A square - the equivalent of 100 square feet - of three-eighths-inch plywood the. Click to see full answer Beside this how do I know if my roof sheathing is bad. This kind of plywood can be life-saving in the time of a crisis and is sometimes required in certain areas.

Another is to forgo repairing old plywood or sheathing before doing the install. The new plywood thickness should be at least equal to the exusting plywood thickness. Likewise people ask can you put new plywood over old on a roof.

Lumber wasnt kiln dried so it would shrink upon drying. The keyword here is solid It used to be standard to use shiplap 1 boards tongue groove or other boards for the roof deck. Older homes commonly have one or more.

But Did You Check eBay. One such dangerous way is to shingle over an existing roof instead of tearing it off. Nailing plywood sheathing atop the existing and most likely worn and damaged wood shingles or shakes gives an uneven mailing surface and makes a pine plywood roof decking questionable.

I am planning to have a new roof installed and currently have 38 plywood supported by trusses 24 apart. From Everything To The Very Thing. The reason for going over the existing plywood is simple.

You also should consider the design parameters of the roof to ensure that the extra weight of the added plywood is well within the static load capability of the roof support structure. In This video I show how to replace rotten plywood on your roof without breaking your back. But Did You Check eBay.

Skip-sheeting or spaced sheathing is just as it. Today a shiplap roof is usually 60 years old. Check Out Plywood On eBay.

As roofing contractors in Seattle we are often asked why do we need plywood over our old solid sheathing. In my opinion it would be a better Roofing job to strip off the old shingles. If the roofing underlayment is applied directly on top of the shiplap it will sag into the spaces and eventually leak.

Installing plywood on a roof Hello Youtubers heres another video about plywood sheathing and composition shingles after replacing all damaged wood and. Plywood typically comes in 48 ft. Annonse Looking For Great Deals On Plywood.

When you have the shingles off the roof of a finished house it is a race against time to get the shingles back on and dry to the weatherMost crews are going to be more comfortable and faster on the roof with the old roof sheathing in place while maneuvering the new plywood in place. The entire roof deck is relatively uniform where you can step on any part of it without slipping through spaces. CDX plywood is a construction-grade type of plywood that is designed for exposure to the elements.

My neighbor had an additional 38 layer of plywood added.

Any Advice On Adding Plywood To Roof Contractor Talk Professional Construction And Remodeling Forum