For questions regarding the roof of a home or other structure in general, including roofing types, installation, maintenance and repair, upgrades, venting, and potential problems.

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1answer
15 views

How to prevent concrete roof from Absorbing water

It's winter again and rainwater still collects on my flat roof due to it's bad tilt, Because of that the concrete absorbs a lot of that water into the second floors roof and it's really visible on the ...
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0answers
34 views

truss mathematics for a 30x50 building with cathedral ceilings

A wing of an existing building needs a new truss system and a new roof. The wing is 30' x 50'. The nature of the wing's attachment to the rest of the building limits the height of the truss system ...
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1answer
14 views

Low slope roof (2:12) - acceptable for metal roofing?

I'm designing a garage for my backyard and I want to obscure my view as little as possible. I've read that asphalt shingles aren't great on a 2:12 slope, so I'm just planning on using metal roofing. ...
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0answers
10 views

Covering / Cap over DWV vent pipe

I've eliminated a DWV vent pipe during a bathroom remodel (consolidated fixtures and went from 2 vents to 1) but I don't want to mess with roof patching/repairing if I were to undo the penetration of ...
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1answer
31 views

How should I stop condensation on my roof that's leaking into my home?

Condensation in my attic causes frost which melts on warm days and leaks through my ceilings. I plan to add more insulation this spring. I have installed a bathroom ceiling fan to help with moisture. ...
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2answers
215 views

What are the advantages and disadvantages of elastomeric coatings versus shingles?

I'm ready to reroof my house and want to consider an elastomeric coating rather than replacing the existing shingles. I'd use a local contractor either way
6
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6answers
928 views

Should I replace fallen gutters?

This past winter a heavy snow fall ripped two sets of gutters off our house, and I haven't had a chance to re-hang them yet. One is over our back door and it's really annoying having the running off ...
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3answers
382 views

Why should I repair/replace roof just because it's old?

My roof is old. Shingles are worn down, some are torn, and there are some nails coming through some shingles. I'm being told by some contractors there for other reasons that my roof needs immediate ...
6
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4answers
1k views

How to I safely anchor a safety line to a chimney?

I am going to be installing an antenna at the top of my brick chimney and I'd like to be able to use a safety line with a fall arrestor. The chimney visually looks OK. I'm trying to figure out the ...
7
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5answers
1k views

How can I add insulation to my roof?

I have an old 1930's house, the upstairs of which is in the pitched roof space. I've just checked and it has no insulation what-so-ever up there, so it is very much the same temperature as a loft at ...
2
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3answers
60 views

Best shoes for walking on a standing seam metal roof?

I went up on my roof this weekend to do some work on an antenna and clean chimneys. It's the first time I've been up there since I replaced the hail damaged asphalt shingles with standing seam steel. ...
3
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1answer
238 views

Is sheathing required under a hybrid concrete tile roof?

We have hybrid concrete tile roof that has concrete tiles attached to a dense foam backing. The roofing was installed about 15 yrs ago. In looking in the attic, I noticed there is not plywood or ...
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7answers
16k views

What is better for a roof, plywood or OSB?

While watching the builders next door do their thing, I became curious with their technique to install plywood on edges neighboring the next townhouse, and OSB for the rest (which for these narrow ...
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2answers
59 views

Optimize insulation cost / benefit

I have roof made by scheme from images. Both should be same, just different angle. I have 20cm of space yet to fill. How can I calculate conductivity in W/m2K if i fill missing 20cm of space with 20cm ...
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0answers
28 views

What type of furnace vent pipe is this?

I need to extend my furnace vent pipe up 2 foot above the ridge of my roof to comply with IBC. So I need to couple this pipe somehow and extend it up. Any idea what type of pipe this is and how I ...
2
votes
1answer
121 views

Do I need soffit vents and can I add them without taking the roof apart?

Last year, we re-roofed out 83-year old house. We removed the 3-layer cedar/asphalt shingles and laid plywood decking, 30# paper, ice-barrier and 26-gauge metal roofing. As far as ventilation, we just ...
1
vote
1answer
224 views

Gable and Roof Vents Together?

I need to add some additional exhaust venting to my attics, along with some along the soffit as well. I need some knowledge on a few things as I can't seem to find answers for them on the interwebs: ...
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0answers
28 views

concrete and slate roof has started to leak

I have a house with a concrete roof with slates stuck on it (probably using gypsum). The roof is pitched, I would guess somewhere around 20 degrees. It has started to leak in a few locations. Can ...
0
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1answer
57 views

Condensation at roof, down outside of furnace/water heater vent. What is happening?

I am getting condensation dripping down the outside face of my furnace vent at the roof. I think I know why this is happening I'm just curious how to remedy it. There is a cast iron exhaust pipe that ...
5
votes
2answers
3k views

How can I patch holes in the roof left by satellite dish removal?

My house came with 2 satellite dishes mounted to the roof around the same place. I've never used them. Recently, wind managed to push them down so that one came down completely and the other was ...
0
votes
1answer
667 views

Attic Venting of Knee Wall in Cape Cod

I have a cape cod style home, pictured below. The second story living space on the back side of the home is created by having a lower pitched roof. So, the front and back sides of the roof have ...
2
votes
1answer
961 views

Moisture/Dew on Roof in Morning

I just had a new roof installed and it looks decent enough. They replaced my metal ventilation with some plastic vents, which is fine, but I'm not sure if it was enough. I had a two layers of asphalt ...
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0answers
34 views

Extending the back of our house

We are going to be replacing our entire roof with a metal roof this summer. I was wondering if it would be possible to extend the back of our house before we put on the new roof. We would have to pour ...
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0answers
30 views

I need a blue print or measurements on how to build a barn roof

I am building a 16'x 16' shed and would like to get a blue print or mesuements on how to build a barn roof on the 16' shed
3
votes
2answers
99 views

Roofing solution for “dead valley,” where one plane goes into side wall?

Problem I am reworking my roof on the front of my house. The previous roof had been leaking down the corner of the house where the garage and porch roofs come together. The previous roof had a sort ...
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0answers
17 views

How do I clean a white cement Spanish-type tile roof?

I have a white cement Spanish type tile roof that is very dirty. What is the best way to clean it? Can I power wash it?
1
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3answers
64 views

Should I add wood sheathing to a metal roof car port?

I'm making a carport that is about 10 feet wide with 2x6's for the "roof frame" and 4x6 posts. I was going to use a medal roof using tin I think. Do I first need to put down wood sheathing? Or can I ...
3
votes
2answers
729 views

Which flat roofing system requires the least maintenance?

I am a board member of my townhouse homeowners association and our townhomes are unfortunately very tall (need a lift or 60 ft ladder to access the roofs) and also the builder made the roof one single ...
6
votes
4answers
11k views

Does water dripping through my soffit indicate a problem?

When it rains, water drips through the soffit and along the inside face of the fascia. This picture shows the water dripping through, but when it rains harder sometimes there's more: My landlord ...
1
vote
2answers
60 views

How to stop this small roof from leaking?

We have water stains in the ceiling drywall underneath this small section of roof. I suspect it's due to the loose metal that's on top of the shingles. The fasteners on the top of the metal are ...
0
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0answers
20 views

Fixing glass onto a porch roof

Ive made myself a fairly large porch area on the front and side of my house. Im in the UK but Ive always liked American style porches, so ive ended up with a porch that is 7.5m along the front and ...
5
votes
2answers
131 views

Is Roof De-Icing Cable good for the roof?

Is heat tape or Roof De-Icing Cable good for the roof?
4
votes
3answers
3k views

Do I run screws through the “tops” or through the “bottoms” of the corrugated steel in roofing?

Suppose I want to cover a roof with corrugated steel sheets. Imagine a sheet laying on the roof. It will have "tops" - zones that are further from the roof surface and "bottoms" - zones that are ...
2
votes
2answers
268 views

What's the true longevity of exposed fastener metal roofs?

I want to replace my roof. Exposed-fastener metal roofs are popular and common where I live, but nobody nearby has owned one long enough to really comment on the longevity. I worry that over time, the ...
4
votes
3answers
130 views

Will foam-filling this gap create problems?

I'm trying to find out if I can spray-foam fill a gap in my ceiling. I have an almost-flat rubber roof, 1" foam, wood planks, then a gap created by 2x6s, then the sheetrock ceiling. I'm in PA, climate ...
7
votes
2answers
1k views

Do I need to add roof vents if I close off a small attic space in the garage?

I have a small section of roof over the front of my garage, which I would like to insulate and drywall (making my garage fully insulated). It is 39" high, and 54" by 17', framed with 2x4 trusses, ...
11
votes
3answers
3k views

How do I handle significant snow and ice dams on a 4/12 gable roof with ridge vents?

It is our first winter in a new-to-us house, that has a pretty flat roof (3/12-to-4/12 pitch), and a ridge vent along the entire top of the roof. We just had the snowiest December on record ...
4
votes
3answers
2k views

Can you use plywood as roofing?

I've seen buildings where plywood was used as both wall sheathing and siding. T-111 is commonly used this way, for example. Would it work to do the same thing on a roof? I assume it wouldn't last ...
1
vote
2answers
48k views

What is the minimum roof slope to accommodate rainwater drainage?

I have a patio with a 13ft(4m) by 26ft (8m) Roof, the slope runs vertically down the short (13ft) side.. and the height difference from the high point to the low point is only about 10in (25cm). ...
1
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2answers
56 views

Hardware (clamp and/or spacers) to mount a horizontal pipe to a roof?

Related question: What is this called (adjustable angle pipe footplate)? After posting that previous question, I began to think that there's likely both a cheaper, and sturdier way to accomplish what ...
0
votes
1answer
62 views

How much work would be required to repair this roof?

I'm looking to buy a new house that needs a lot of work doing (almost a complete renovation job, rewiring, plumbing, damp proofing etc). On the last visit I went up into the loft to see what work ...
1
vote
1answer
37 views

How do we properly insulate a loft ceiling with 2“ by 4” without loosing space?

We have recently started a home improvement project that involved completely redoing all of our vaulted ceilings. We have a loft area that was about 6 foot in height at the peak. When we did the demo ...
1
vote
2answers
1k views

How to attach ledger board to under-roof siding?

I want to attach a ledger board, over the existing wood siding. Something similar to this, but immediately underneath the roof How do I determine where I need to drill the holes to attach it to ...
3
votes
2answers
348 views

How would a professional flash this?

I could really use some professional advise here. I removed a piece of rotten trim I found while cleaning the gutters. The problem is pretty apparent in the photos with the gutter removed. Water ...
2
votes
2answers
84 views

How can I build a shed in two halves and join them without the roof leaking?

I am building a shed and I need to build it in two halves so I can take it off the foundation if I need to. The problem is that due to the dimensions, I have to split it in such a way the split line ...
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vote
0answers
27 views

Can I extend attic vents so they don't get blocked by snow?

I have 2 square low profile attic vents on the detached garage but I'm pretty sure they are blocked with snow during the winter. If I should alter them, are there extensions available to raise these ...
3
votes
1answer
104 views

Should my chimney sit on my roof?

I am renting a house built in the 1940s. The mortar around the brick was cracked causing leaks. Someone had built a chimney around the outside of the original chimney. So outside it's twice the size ...
2
votes
1answer
99 views

Should I keep downspout extenders installed during the winter?

Should downspout extenders be kept installed during winter? For some reason, I think they facilitate ice formation to creep up the spout? When I say downspout extenders, I mean these
0
votes
1answer
83 views

Is there a tool that will crimp close the end the ribs on a metal roofing panels?

I saw a building that had the exposed bottom edge of the ribs in the metal roofing panels crimped closed so bugs couldn't craw or fly up them. It was very neat/professional looking as if it had been ...
0
votes
1answer
42 views

Heating Coils on a metal roof section

I have a metal edging on my roof in an area about 4 wide. Can I run heating coils over this metal section of the roof,because it seems to be an area that has ice dams. Presently I have a coil above ...