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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3
votes
4answers
17k views

What is the method to seal a concrete roof?

We are staying in a home which has a concrete roof. Now we are facing leakage in the roof during rainy seasons. What do we have to do? How do we protect the roof from leaks?
3
votes
2answers
4k views

How do I fix a leaking skylight?

I have a skylight on a shingles roof. I don't know much about the skylight as it was installed by a previous owner, but every year, at the beginning of the rainy season, the skylight leaks. And every ...
3
votes
2answers
1k views

Insulating a post and beam construction roof/cathedral ceiling

My house (built 1972) has a cathedral ceiling with post-and-beam construction in the main room. The ceiling temperature can get as high as 90F, or even greater on a very hot sunny summer day, as ...
3
votes
1answer
382 views

Are alternative roofing types, such as rubber roll, usable for a typical residential sloped roof?

I'm wondering specifically, if rubber-roll roofing, such as this can be used on a sloped roof. Or maybe if there is something akin to the stretch-and-seal tape but in large sheets that would be ...
3
votes
2answers
286 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 ...
3
votes
2answers
1k 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 ...
3
votes
1answer
6k 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 ...
3
votes
3answers
350 views

Roof stone tiles. How to fasten them?

I am watching a TV program where they are restoring a ruin into a cottage. One thing that left me aghast is the fact that the roof was made with flat, very heavy stone tiles. Ater they rebuild the ...
3
votes
2answers
149 views

How can I inspect and repair a roof with moss and other greenery on it?

I have a pantry on my house, its attached to the kitchen but has its own slated roof and an outside wall. I have has issues with it getting damp, I have replaced the outside door as that was leaky, re-...
3
votes
2answers
15k 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 ...
3
votes
1answer
68 views

WIll electric pressure washer work with low water pressure?

I live in a 5th floor of a building that doesn't have strong water pressure. I remember that many years ago a cleaning group was going to pressure-wash the exterior of the building, but couldn't ...
3
votes
1answer
5k 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. ...
3
votes
2answers
318 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 strips/...
3
votes
1answer
926 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
1answer
328 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 ...
3
votes
1answer
970 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 ...
3
votes
3answers
188 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 ?
3
votes
1answer
445 views

Roof Showing Some Dipping

I recently walked my roof. There are some low spots, like little depressions. What causes this and should I be concerned? It seems that the plywood underneath is good but it seems like the ...
3
votes
2answers
165 views

Repairing a notched rafter in a truss roof

I had a guy install a whirlybird-type vent in my roof.. those non-powered turbine types. Upon cutting the hole to install the vent, he accidentally cut a notch in the rafter: ). There are two ...
3
votes
2answers
2k 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 ...
3
votes
1answer
128 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 ...
3
votes
1answer
99 views

Which kind of roof coating to use to treat low pitch mod bit roof?

My city row house is 100+ years old and has a low pitch modified bitumen roof. It looks like a one piece asphalt or tar sheet covering of the roof. I bought the house 7 years ago and never had it ...
3
votes
2answers
118 views

How to protect exterior galvanized flashing?

With ships, they'll bolt zinc blocks on, can I "re-galvanize" metal? I ask as I have some flashing that was likely installed in 1938. It was galvanized and is in reasonably good shape. But replacing ...
3
votes
1answer
2k 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 ...
3
votes
1answer
475 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 ...
3
votes
1answer
718 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, ...
3
votes
1answer
2k views

Best way to flash an EPDM rubber roof on a concrete roof deck?

I'm planning to install an EPDM rubber roof on my 1922-built, poured concrete garage. The concrete deck leaks heavily during rainstorms, and it looks like installing an EPDM roof is just within my ...
3
votes
3answers
1k views

How to properly ventilate a Mansard Roof?

I recently purchased a home with a Mansard roof, I had some roofers come to give quotes to replace the top (it is finished) and they all recommend adding ventilation (known issue with Mansard's). ...
3
votes
1answer
333 views

Getting R38 in roof with 2x8 rafters

I was planning to use foil faced 2" polyiso plus an air gap, plus 5 1/2 rock wool, to get 13+3+23, or r39. But this is all between the rafters below the roof deck, and the polyiso is impermeable. If ...
2
votes
6answers
45k views

How do I approach new water stains on my ceiling?

I am a brand new home owner with almost no experience with DIY stuff. There was a few days of significant rain and now my wife noticed some stains on our 2nd floor ceiling that we are pretty sure ...
2
votes
3answers
680 views

What size beam do I need, and can I build one from lumber and steel?

I want to support a 20 ft. span of my roof where two roofs come together. My house is was originally 46'by 20'. A 40'by 12' addition was added, making an L shape, and when they put the beam in they ...
2
votes
2answers
9k views

Ways to Safely Repair 45 Degree Pitched Roof without Jacks?

What methods can a person use to safely repair a roof that is slanted at a 45 degree (or greater) angle without using Roof Jacks? Is there anyway it is possible for a person to safely walk on such a ...
2
votes
2answers
2k views

Why am I getting a lot of condensation in new shed?

I just got a new shed built with concrete blocks and a metal roof last month and thing is dripping with condensation from the roof. There is absolutely no insulation in the shed. How would I get rid ...
2
votes
2answers
960 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
1k 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' ...
2
votes
1answer
155 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 ...
2
votes
1answer
133 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.
2
votes
1answer
2k 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 ...
2
votes
3answers
823 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 ...
2
votes
1answer
957 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 ...
2
votes
2answers
742 views

TV antenna moves a bit - problem?

I'm partway through installing my own outdoor TV antenna. I've gone with a "through the roof and screwed into a beam" method rather than the "sit on top of roof and stabilise using 3-4 wires screwed ...
2
votes
2answers
204 views

Lift existing roof frame to replace top logs in log home

We have a log house with a 12/12 pitch roof. This summer we're planning to take off all the old asbestos tiles and leave the existing roundwood framing and put in new tiles of some kind, or metal ...
2
votes
2answers
120k 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). ...
2
votes
2answers
869 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
1k 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 ...
2
votes
1answer
132 views

Roof trusses left out in rain, are they still good?

I experienced a house fire in May 2015. The house is undergoing a full gut job. The roof has to be completely replaced. Unfortunately, I hired the wrong contractor and they have been taking their ...
2
votes
2answers
122 views

Ceiling wet at corner of chimney

Whenever it rains, the ceiling becomes wet at the corner of the chimney. I ASSUME it's just a small leak, but obviously I don't want it to become any worse. I have a flat roof, so getting up there ...
2
votes
2answers
143 views

How can I reduce how much a flat roof heats my house?

My flat roof is insulated with wool, but still it's heating up my room considerably. The situation is much better in the rest of the house. Any ideas how to do a quick fix? The roof is currently ...
2
votes
3answers
3k 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 ...
2
votes
2answers
40 views

Flat roof ponding near drain - should roof be raised?

We recently raised a dipped section of our flat roof in order to reduce ponding. We're not sure we've raised the roof enough. Here's what it looked like as the rains died down. Do you all think we ...