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.

learn more… | top users | synonyms

2
votes
3answers
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 ...
6
votes
2answers
542 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 ...
2
votes
3answers
573 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
208 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 ...
1
vote
2answers
2k views

Exhaust fixture for venting bathroom fan through roof

I'm planning to install a roof vent for a bathroom exhaust fan I'm putting in. I'm thinking about using one of these: but I was wondering if I need to worry about it getting blocked by ice or snow? ...
7
votes
1answer
340 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 ...
6
votes
4answers
9k 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 ...
3
votes
1answer
184 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 ...
5
votes
1answer
2k 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
543 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.
3
votes
3answers
17k views

How to remove moss from my roof?

My roof seems to be growing moss and I'd like to remove it. I did some research and it looks like the solution is to mix water and bleach, spray the mix on the moss and then scrub the moss off about ...
2
votes
2answers
526 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 ...
6
votes
2answers
5k 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 ...
2
votes
2answers
609 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 ...
2
votes
3answers
710 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
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 ...
4
votes
2answers
2k 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 ...
3
votes
2answers
769 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

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 ...
3
votes
3answers
5k views

Is installing a gable fan worth the investment?

We have 2 gable vents in our roof (approx 2' high or so), one at either end, and upon inspection it does not appear that there is really enough overhang in the roof for soffits. I still have to ...
1
vote
1answer
920 views

What could cause water to not go into the gutters?

I recently installed vinyl gutters around the roof of my house, but after the first rain I discovered that the gutter doesn't seem to be catching a lot of the water. Much of the water seems to be ...
2
votes
3answers
637 views

How do you calculate if it's worth it to insulate?

We live just north of NYC, and the house was built in 1906. We're putting on a new roof and trying to figure out if it's worth it to insulate too. It's a cathedral ceiling on the inside, and we do ...
4
votes
2answers
3k views

How do you install zinc strips in a roof without creating leaks?

This article gives instructions for installing zinc strips at the ridgeline to inhibit moss. This picture shows nails through the zinc strip: It looks like they have nailed through the zinc in to ...
5
votes
4answers
795 views

Is it possible to collect rain water from a roof for drinking use?

For a re-roofing or new build, I was pondering the possibility of capturing and purifying water for drinking use. Are there good examples of this? What roofing materials should be used or avoided? ...
1
vote
1answer
292 views

Mould on the inside of a bitumen corrugated sheet

Attached to the end of our house is a small shed. It has four (newly built) brick walls and a bitumen corrugated sheet roof. The shed was finished about eight months ago and is fairly waterproof. ...
3
votes
1answer
439 views

What do I need to do to finish a roof with exposed rafters on a shed

I have a shed as pictured that had never been finished completely. As such the shed has a lot of dust debris, etc getting in that should not be. What do I need to do to finish the shed. Should I be ...
7
votes
3answers
285 views

Wind Mitigation

I live in Jacksonville, FL and my insurance premium went up by about $500/yr. I was told that the biggest reason was because my house isn't up to current code for hurricane/wind mitigation. I'm a ...
2
votes
1answer
959 views

Do I need soffit vents for my knee wall attic?

I purchased a 55 year old home that has no soffit vents. The attic space consists of a knee wall attic space and peak attic space. The peak attic space has vents at each end and a ridge vent at the ...
2
votes
1answer
247 views

How do we keep a porch with a fiberglass roof cool?

We have a clear fiberglass roof on our enclosed porch. We just recently put it in. Sun pounds in and by afternoon in the summer, it is SO hot in there. We used to just open the windows and it would ...
5
votes
2answers
724 views

What kind of vent is pictured here and what are its uses?

While my roof was being replaced, I requested that they install two roof vents. One for laundry and one for bathroom fan. They installed two of these. I just tried connecting the bathroom fan to this ...
1
vote
0answers
175 views

Can I repair damage caused by a roof leak myself? [closed]

To fix the exterrior wall, inside the wall and interrior wall can I have friends who are builders help me or do I have to go with a contractor? Also do I need a building permit for this. I had my ...
6
votes
1answer
3k views

How can I lengthen my vent stack and are there any negative effects in doing so?

I have observed that when we receive a lot of snow here in Ontario, at least one of the drain vents on my roof is covered by snow. While after one winter in the house I have not yet observed any ...
2
votes
1answer
123 views

How do I install roofing material on a roof with a ridge vent?

I am helping a friend repair his roof; his roof has a roof vent at the peak of the roof. I've done a few roofs, but never with a roof vent. So any help in how you roof with a roof vent? I assume ...
1
vote
2answers
312 views

How can I find the source of a leak?

We have a lead lined, concave roof on a bay window. The roof itself has a small drain. Inside the house, below the bay window we have a small leak that occasionaly appears when it rains. I have ...
5
votes
1answer
192 views

How do I fix a leak in this roof?

A few days ago we had a good amount of rain that fell over a 36 hour period. During this time, a leak showed its ugly face. I got up into the attic, found the water stream and traced it back outside ...
5
votes
1answer
491 views

How do I close off attic vents?

First of all, I'm clueless when it comes to DIY so forgive my amateur lingo and general clueless attitude. I'm still learning, be patient with me. My wife and I bought a house on the sunny island of ...
11
votes
2answers
13k views

How do I use an extension ladder to get onto my roof?

I have a two storey house and need to get onto the roof to apply some heat paint on my furnace exhaust pipe before winter. It looks about 20-22' from the ground to the edge my eaves, so to be safe I ...
3
votes
2answers
6k 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 ...
4
votes
3answers
382 views

How to introduce more run into roof?

I have a 16'x20' deck roof that is attached to my garage on one side and (3) 4"x4" posts on the other side. The rise over the 16 feet is about 2 inches which is not enough for the water to get off ...
9
votes
2answers
2k 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 ...
3
votes
2answers
691 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 ...
3
votes
3answers
958 views

Does a device exist that can help find the source of a leak in a flat roof?

My Dad has a flat roof over his garage. It's covered with tar and felt. We had an unusually hard and cold winter last year (Republic of Ireland) and since then the roof has developed a leak. We've ...
5
votes
1answer
4k 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 ...
6
votes
2answers
4k views

Do I need soffit vents when I have 2 gable vents and 5 normal peak vents?

We are in southeast Idaho, have a plain simple gable roof on a 1,050 square foot floor house; the roof's pitch is not great, probably 3 or 4/12 but normal for our area. We have 1 vent at each gable ...
3
votes
1answer
546 views

How do I properly install underlayment and a modified bitumen roof on a flat garage roof with concrete walls?

My project is to replace 18'x10' flat roof on my concrete garage. So far I installed 16" oc framing and 3/4" plywood over it. Now I am planning to install some fiberglass based underlayment (#30, ...
2
votes
1answer
119 views

Can I tear down a roof with a torch? [closed]

Can my friends and I use a torch gas cutter to cut into the roof, and dismantle everything by sections? I imagine there will be some concrete layering underneath and such.
6
votes
2answers
3k 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 ...
13
votes
6answers
15k 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 ...
3
votes
1answer
3k views

How do I nail plywood to flat roof framing?

I am putting some 3/4 plywood on top of 2x6 framing joists on my flat garage roof. The framing is spaced 16oc. I figured that I place 4x8 plywood sheets in such way that their short edge will be ...
1
vote
1answer
1k views

How can I modify this dryer vent cap to keep lint from getting trapped?

As mentioned in this question I installed this dryer vent cap on my roof As you can see, there is a gap between the flashing and the cap, presumably to let water out if it gets in. This is ...