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Old 05-14-2013, 02:36 PM
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Default How long should roof nails be?

I know nothing about roofing but it looks pretty easy. I plan on doing my shed which is 160 sqft. Built 15 years ago, shingles are really showing their age. I plan to shingle right on top of the old ones. 1/2 plywood is in great shape from what I can see from inside, no leaks, some minor holes coming thru from the existing nails. I have no idea what length of roofing nails I should get. The plywood is 1/2, my guess is the existing shingles are 1/4 thick??? Would using 1 inch nails be correct???

Thanks
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Old 05-14-2013, 02:39 PM
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Usually we use 1.5" when do a shingle over. When going over just plywood we use 1.25"
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Old 05-14-2013, 02:51 PM
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I know nothing about roofing but it looks pretty easy.
So is.....

bricklaying

carpentry

cabinet making

mechanics

rebuilding transmissions

and

rocket science



just bustin your stones

When you watch someone who does their skill or craft very well it does look easy....until you try it

1 1/2" nails and the directions are on the back of the package and fairly easy to follow
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Old 05-14-2013, 03:02 PM
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Chaaaaa.... they just use airguns with big staples here. Fast and furious.
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Old 05-14-2013, 03:33 PM
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Originally Posted by bigjimmie View Post
So is.....

bricklaying

carpentry

cabinet making

mechanics

rebuilding transmissions

and

rocket science



just bustin your stones

When you watch someone who does their skill or craft very well it does look easy....until you try it

1 1/2" nails and the directions are on the back of the package and fairly easy to follow


Thanks, what I should have said is it should be easy since I'm just laying shingles on top of shingles. I know how difficult roofing can be. Last fall my neighbor had a copper standing seam roof and soldered coppers gutters installed. I was really impressed by how the guys did the job

Thanks all
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Old 05-14-2013, 04:30 PM
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To hold properly they must penetrate through the roof deck..better too long than too short.
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Old 05-14-2013, 04:31 PM
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Use 2" and then go under the roof and bend em all 90 degrees. It's a little more work but they hold a lot better.
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Old 05-14-2013, 05:02 PM
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To hold properly they must penetrate through the roof deck..better too long than too short.
agree, no staples, read up on the miami dade code.
6 nails per shingle
roofer wont do it?
get another roofer
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Old 05-14-2013, 07:33 PM
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It's actually not as simple an answer as you might think. I have 2 boxes of 1.25" (that's 14,400 nails) because that's average for the roof decks here.

My porch is open on the bottom with a (7/16")? beadboard finish and 1/2" sheathing on top of that. 1 1/4" would penetrate the beadboard, so I went with 1". Per the manufacturer, the 1" is fine for my application. Not saying it would be OK in Dade county or that I wont have a problem in the future. Two of us built a 8 X40 porch with a new roof to the ridge in 2 weeks, so I'm not concerned if I loose a shingle or two in a hurricane.

The number of nails and nailing pattern is on the bundle of shingles. My lifetime architectural shingles are installed different than inexpensive box store brand.

I don't think I'd try Shag's approach.
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Old 05-14-2013, 10:01 PM
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1 and a half, full ring shank

choose your nail gun
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Old 05-15-2013, 02:57 AM
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I have the minimum mfr specs at the office....hold on. Or you can google the specific shingle install instructions...it will list the penetration requirements there.
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Old 05-15-2013, 04:07 AM
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If you do not own or have access to a nail gun/ compressor I wouldn't bother for that small of a roof. Besides, hand nailing is better in my opinion. If you've ever tried holding a 1" roofing nail and hit it with a hammer you know you will bust finger nails. So, for that reason alone, I would recommend 1-1/2" nails. Also, with a roof-over, cut the top of the first row so it butts up to the bottom of you existing shingle. Then the rest will do the same. This method is usually referred to as "butt and go" and you can probably google it to get a better idea. It requires very little skill or talent, because you follow the original shingle lines.

Here found a picture that shows it:

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Old 05-15-2013, 04:14 AM
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Nails need to extend 3/4" into the deck material. When the deck is less than 3/4" nails should extend through at least 1/8".

That comes from the ARMA handbook and is repeated in nearly every manufacturers install instruction.
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Old 05-15-2013, 04:37 AM
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If you do not own or have access to a nail gun/ compressor I wouldn't bother for that small of a roof. Besides, hand nailing is better in my opinion. If you've ever tried holding a 1" roofing nail and hit it with a hammer you know you will bust finger nails. So, for that reason alone, I would recommend 1-1/2" nails. Also, with a roof-over, cut the top of the first row so it butts up to the bottom of you existing shingle. Then the rest will do the same. This method is usually referred to as "butt and go" and you can probably google it to get a better idea. It requires very little skill or talent, because you follow the original shingle lines.

Here found a picture that shows it:

I missed the part that the OP was doing a roof-over. On the few I've done, it's always been a complete tear off with new metal, new flashing, added shield, new flashing and new 30lb felt. I go by the assumption that there are hidden problems and the original install wasn't done right.
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Old 05-15-2013, 04:55 AM
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Take the old shingles off.
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Old 05-15-2013, 04:57 AM
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Roof overs are indeed the cheap way out. A shed..fine, if your code allows it. Home, never.

remember, your adding 400-500 lbs. to your shed roof..is it strong enough?
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Old 05-15-2013, 05:00 AM
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Roof overs are indeed the cheap way out. A shed..fine, if your code allows it. Home, never.

remember, your adding 400-500 lbs. to your shed roof..is it strong enough?
Typical roof is 260lbs per square (100sqft).
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Old 05-15-2013, 05:10 AM
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Typical roof is 260lbs per square (100sqft).
yea..roof is 1.6 squares.

Down here, gotta tear off the roof, renail the plywood, use only 30# ASTM felt, bull the starter shingles down...PITA. I was also surprised at the number of shingle roofs which failed in the hurricanes, Best roof..metal. BTW, it's great for a shed..put a slip sheet between the metal and the shingles, screw the new metal on.
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Old 05-15-2013, 05:24 AM
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I'd tear off.

I know you can nail over once and it's cheaper-easier to do, but I have never nailed over.

Regular 20 year shingles are 270# per square.

Use a 1-1/2 roofing nail. No way would I use a staple. If you ever have to deal with that roof again, you will be glad you tore off the first roof and didn't use staples.

I'm not in the business nor did I sleep at a Holiday Inn Express, I am a veteran of many weekend warrior roof jobs. Friends, family we all used to get together and reroof each others homes as needed.

Code? It's a shed why does code dept need to know about your shed?
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Old 05-16-2013, 07:24 AM
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I agree with most - it will take you maybe 3 hours to strip that 160 sq. ft roof. another hour to repaper it, and it will last much longer than a re-roof.
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