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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4
votes
2answers
941 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 ...
14
votes
6answers
7k views

What are the pros and cons of steel vs. aluminum metal roofing?

I'm considering a new roof for my suburban home. The home is about fourteen years old and the shingles are in so-so shape. We have had two leaks already and I've been told that means it is a good ...
5
votes
4answers
460 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 ...
5
votes
2answers
420 views

Can you have different types of vents on a single roof?

The attic of my house has serious ventilation issue and the sheathing becomes rotten. The roofing contractor suggests me to replace the rotten sheathing and install some ridge vent. His plan will ...
2
votes
2answers
116 views

How should I waterproof a concrete roof?

We have a 28y/o Medical Clinic in a remote area of Haiti. The roof is concrete and has one coat of DryLoc on it which is lifting off in many areas. The roof is 136' X 35' with a very slight pitch to ...
3
votes
1answer
298 views

Should I seal these areas in my roof?

Our home has some areas where the different pieces of roof meet the primary roof. These may or may not meet the criteria for "dormers." I recently had a local worker do some caulking & painting. I ...
0
votes
0answers
390 views

How should the gutters be installed on a huge gable dormer?

I have a situation similar to this photo (except my "dormer" is 24 feet long), focusing on the upper gutter: I think it makes the most sense to catch rain/debris from a roof valley in the main gable ...
3
votes
2answers
2k views

What is the max distance between top of gutter and the roof tiles?

I am about to replace my gutters, one guide I have read say the gutter should never be more then 30mm below the bottom of the roof tiles, another says 50mm. What is the reason for this? What is a ...
5
votes
1answer
353 views

What kind of repairs are prudent for a ridge board damaged by a falling tree?

The limbs of the tree punctured the roof in at least two spots, so we're already looking at repairs. Upon closer inspection within the attic, I noticed that the ridge beam is just slightly splintered ...
4
votes
6answers
4k views

Would putting a sprinkler on my roof help cool my home?

Anyone ever put a sprinkler on your roof to help out your A/C on unusually hot days? Just wondering if it helps.
1
vote
1answer
111 views

How can I create a polycarbonate roof valley?

My roof valley is wider than this. I want light to pass in through. Is the polycarbonate I should use? Can I make a joint somewhere in the middle through the length with polycarbonate. I need some ...
5
votes
2answers
559 views

Should I insulate my roof on the inside or outside?

I am renovating my house and am completely redoing my flat roof: ceilings, insulation and roof covering (I am planning to use EPDM rubber). In case it is relevant, I am living in the Netherlands. My ...
3
votes
1answer
1k views

How can I install soffit vents from the outside?

When we moved into the house we live in there was literally no insulation in the attic. We have a 4 1/2 pitch roof. We live in Texas and our first electric bill in a 1450sf house was almost $500. ...
2
votes
1answer
277 views

Is a roof sprinker a good idea?

I live in an area where temperatures often reach 95°F (35°C). I have attic fans and soffet vents and radiant barrier. Is it worth adding a roof sprinkler? I have read about it working wonders ...
4
votes
6answers
6k views

Is a roof made out of glass viable?

I have thought about that if I am ever going to build a single floor house this is what I would do. I would make the whole roof out of glass (like a greenhouse). This glass roof would be made out of ...
6
votes
2answers
340 views

When is it time to replace the roof?

I've read several some of the guides out there (examples here and here) on this topic. I've found a shingle in the yard a couple times (after heavy wind/rain), and at times I've seen a few granules ...
5
votes
3answers
721 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 ...
3
votes
4answers
507 views

My house is nearing 20 years, what will break soon?

Okay, I recently learned that most appliances/things start breaking once the house reaches around 20 years. I'm running 19 now. From what I have heard, roof (although mine is apparently a 30 year ...
3
votes
2answers
154 views

Should I paint wood in a roof that is not directly exposed to the outside?

I'm currently in the process of replacing the roof of a room. This room was originally a balcony, so has never been part of the main house. The roof that was removed had wood beams with wood ...
4
votes
1answer
2k views

How do I seal a leaky roof and repair the minor ceiling damage it caused?

We recently had some very heavy rains and during the worst of it we had some leaks. When I noticed the problem, I went into my attic and found out that the leak was coming from around a vent in the ...
2
votes
2answers
4k views

How do I build a Gambrel roof?

We would like to put a Gambrel Roof on a 32 x 32 log cabin we're building but I don't know the formula or how to build the Gambrel roof. Please help We're building this cabin ourselves and love the ...
5
votes
1answer
326 views

Will combining roof venting systems cause short cycling?

I'm looking into buying a new house here in Wisconsin that has soffit vents, ridge vents and some additional static roof vents installed. However, when the home inspector came through he said that ...
5
votes
1answer
3k views

Can a gambrel roof have outer instead of inner supports?

I have built some of the "arches" for a gambrel roof, I know support is needed so the roof doesn't collapse. Is it reasonable to run twin metal straps around the roofing diagonally on the outside for ...
1
vote
1answer
272 views

Why am I having an attic ventilation problem this year when I didn't last year?

This winter in the attic I noticed ice on the roofing nails. Obviously warm moist air condensed and then froze on the cold nails. When the weather broke and warmed up a bit, I was back up in the attic ...
3
votes
3answers
169 views

Can you cap a chimney to reduce moisture and still use the chimney with a gas fire?

Or does capping a chimney always remove the ability to use a fire ?
1
vote
1answer
651 views

Can I use a threaded rod for a rafter tie?

Long story short: I am working on a 1960's house with no rafter ties. The rafters themselves are now attached with screws and strong-ties (previously just double nailed!) but I don't have faith in the ...
1
vote
1answer
23k 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). ...
6
votes
2answers
303 views

How much ventilation do I need on a small roof?

This small building has a footprint of 10' x 12' with a gable roof (sideways, so the gables are 10' apart). Slope is 4:12, so the peak is only 2' above the walls. My ridge isn't vented, so I'll be ...
6
votes
2answers
3k views

Can I make the contractor redo a roofing job because he didn't replace delaminated plywood?

My wife and I recently moved into our first home. It's a raised ranch in CT that was built in 1967. I've been doing a lot of "refreshing" myself inside; however, I hired a roofing contractor to ...
4
votes
3answers
12k views

How do I find the source of the water leaking through the ceiling?

I live in Minnesota in a single story rambler with full basement. In an upstairs corner bedroom I started noticing some water leaking in the closet ceiling a week or two ago (picture is current, it ...
3
votes
1answer
374 views

How much sag on a roof is acceptable?

I have minor sagging of my roof plywood, 3/8" thick, placed on trusses 24" apart. Is there an amount of sag that is technically okay? I could not find anything on the APA website. I am not worried ...
3
votes
2answers
5k views

What should I do about water dripping into my smoke detector from the attic after a heavy rain?

I live in the Midwest of the United States, and we not-too-rarely get a large amount of rain coming down at one time both in the spring and sometimes in the fall. Last night was no different (aside ...
6
votes
2answers
2k views

How is installing roof sheathing horizontally stronger than vertically?

Prompted by a comment in this answer: What is better for a roof, plywood or OSB? Why is it stronger to install roof sheathing horizontally? Yes, it ties in more rafters, but in what manner is that ...
5
votes
2answers
687 views

How do I temporarily cover a hole in my roof?

What is the best way to temporarily patch my roof? Tomorrow I'm going to be taking two chimneys out of my house. They are both brick and mortar chimneys. Both of them stick out the middle of my roof ...
5
votes
2answers
3k views

What are the differences between hot and cold roof systems?

Can someone explain the differences, pros and cons of a hot roof vs a cold roof? I would like to vault a ceiling in an addition off of our family room, taking the drywall all the way up to the roof ...
8
votes
3answers
11k views

Why is water leaking near my bathroom's exhaust fan?

This weekend when the snow started melting on my roof, I noticed a small water spot developing around all three bathroom exhaust fans in my house. I'm guessing the water leaked in around the exhaust ...
2
votes
2answers
1k views

How do I set up drains for a flat roof?

In the house I'm building, I will be using a flat roof with a parapet around it. The total area will be around 120 sq meter and the roof will be a concrete slab (at least 8 cm). What is the best way ...
7
votes
7answers
2k views

Should I replace my roof or just fix it?

Has anyone done their roof by themselves? I have a long term plan of building upwards (a second floor on top of my 1939 Cape Cod). Problem is I may not be able to do this right now but my old roof ...
9
votes
2answers
1k views

Should we replace shingles that are curling and losing the asphalt coating before winter hits?

I don't know how long ago this roof was shingled, but we've noticed that the asphalt shingles, in two patches, have begun to curl and lose their grit. Even after a late summer of fierce rain, at ...
2
votes
3answers
476 views

How to address mold/moss on newer roof?

I have an old house with a new(er) installed roof shingle that's about 5 years old. In removing leaves from the gutter today, I noticed green moss? mold? around some of the areas close to the house. A ...
3
votes
2answers
187 views

What limits the number of skylights you can put in a room?

I am thinking of putting skylights in my kitchen between the trusses in the attic. Let's say my kitchen is below 5 trusses, giving me 4 spaces where I can put a skylight. Is there any structural ...
7
votes
1answer
287 views

Cladding removed from sides of dormer, should it be covered if not being replaced for a week?

I'm having all of the soffits, fascias & guttering replaced along with cladding to the sides of upstairs dormer windows. The upstairs windows look like this picture: The guy doing the work ...
3
votes
1answer
149 views

Should I have my old ceiling vacuumed before installing insulation?

My house (built about 1890) has no insulation in the roof and so I plan to put in insulating batts. There is a lot of old dust and a few possum droppings up there, and I have heard that the dust can ...
2
votes
2answers
512 views

Is a thick, unvented hot roof a good candidate for spray foam?

Upon removing some drywall from an unvented hot roof I noticed two serious issues: 1) The roof sheathing is not a taped or sealed ply but a 2x8 T&G 2) There is no vapor barrier and the cavity ...
5
votes
1answer
1k 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 ...
4
votes
2answers
382 views

Should a vent cap be installed under all the layers of shingles, or just the top most layer?

When installing a roof cap on a roof where there are three layers of shingles, do i trim away just the first layer of shingles or should i trim away all three layers to slide the cap underneath.
2
votes
2answers
452 views

What can I do with these roof trusses to cover them up a bit?

Relating to another question about loft conversion I also want to fill up the gaps in between the trusses on which the roof tiles lie on. So during allot of build I heard here and there that some ...
2
votes
3answers
615 views

Is it safe to use a former furnace flue to vent my dryer through the roof?

Our dryer is located in the center of our house. The current vent situation has tubing that makes several bends between the dryer and the crawl space before hitting metal duct that takes it about 25' ...
3
votes
2answers
677 views

Should I pre-built rafter units, or build them in-place?

I'm planning a small roof - 12' x 16', gable style. Almost all the rafters will identical. Should I build rafter units ahead of time? 2 rafters + a ceiling joist + plywood gussets. I'd make a simple ...
4
votes
2answers
1k 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 ...