A question for roofers on CWT....

[eddielasvegas]

Hello All,

I know there are some folks here who do this for a living and I have a question or two that I'm hoping can be answered.  I'm in Scottsdale.

1) Do I need two layers of underlayment?

2) What weight?  #30 ok or will #40 last longer?

Any other info I need before I have a new roof installed?

Thanks,

Eddie

[WHALE]

What type of roofing? Tile, shingles, metal?

[Roofer Billy]

4 hours ago, WHALE said:

What type of roofing? Tile, shingles, metal?

Exactly.. 

30# is designed for asphalt roofs . Such as flat roofing and works good as a base sheet for hot tar roofs. It is asphalt saturated and will dry and crack under tile. 40# works okay for tile roofs etc .but cracks easy. I recommend two lawyers of 40# if your using it.with a 20 inch overlap. Synthetic last longer and works best. But is a pain in the butt to lay. And more expensive. 15# is for shingles. Unless perforated,then it's used as a felt layer for hot roofs. 

 

[eddielasvegas]

4 hours ago, WHALE said:

What type of roofing? Tile, shingles, metal?

Now that would help, wouldn't it?  I can't find an emoji to show I'm a dumbazz for leaving that out so words will have to do. 😆

Concrete tiles are on our roof.  Attached is a pic in case I'm incorrect.

Thanks all,

 

Eddie

[NOTAGS]

Two layers for sure. 40 lb is the standard.  

[Roofer Billy]

9 hours ago, eddielasvegas said:

Now that would help, wouldn't it?  I can't find an emoji to show I'm a dumbazz for leaving that out so words will have to do. 😆

Concrete tiles are on our roof.  Attached is a pic in case I'm incorrect.

Thanks all,

 

Eddie

You have a flat concrete tile roof. 40# should work fine with a double layer. 

[eddielasvegas]

16 hours ago, Roofer Billy said:

You have a flat concrete tile roof. 40# should work fine with a double layer. 

Thanks a million RB.

One more question:  All flashing should be removed and redone, right?

Thanks,

Eddie

[Roofer Billy]

12 minutes ago, eddielasvegas said:

Thanks a million RB.

One more question:  All flashing should be removed and redone, right?

Thanks,

Eddie

Yes ... Some could be used back. If it's not bent all to heck and full of holes. I've always double flashed everything with new flashing and metal valleys,metal edging and etc ..

[catclaw]

I built my current house in 1990. I used one layer of 40# i have S tiles.  I tore my chimney off a couple of years ago and had the roofer there to fix the 10x20 area that I replaced the sheeting on.  He said my felt was in great shape and no need to re roof anytime soon.  

Most of the tile roof jobs that I used to bid for him ended up being a peel n stick type underlayment. 

Felt must be really crappy these days if it takes 2 layers of 40#

[NOTAGS]

Global warming, burning out faster, lol

[Roofer Billy]

11 hours ago, catclaw said:

I built my current house in 1990. I used one layer of 40# i have S tiles.  I tore my chimney off a couple of years ago and had the roofer there to fix the 10x20 area that I replaced the sheeting on.  He said my felt was in great shape and no need to re roof anytime soon.  

Most of the tile roof jobs that I used to bid for him ended up being a peel n stick type underlayment. 

Felt must be really crappy these days if it takes 2 layers of 40#

Not so much that the felt is bad. As the people putting it on. Most the time its illegals getting paid by the square. And they throw it on. Most don't know how to flash properly. They break the tile instead of cutting it. And just plain don't care. Over the years spec's got tougher. All tile must be nailed for the first three rows,and three tile in on all perimeters and hips. Top three rows have to be nailed and every other row. . 40 years ago you could put a single layer of 30# on. And no slats to hold the tile on. Just dry in and lay the tile . No nails .. 

[catclaw]

My next time roof will have runners vertical under the stickers. Water can run under them.  I see a lot of churches doing it this way. Might need bigger bird stop at the bottom