Questions tagged [roof]

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.

104 questions with no upvoted or accepted answers
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62 views

Was my home's dormer flashing installed incorrectly?

I've lived in this home for two years now. Roof is probably at least 10-15 years old, perhaps 20 years. We started noticing some water stains on the ceiling soon after moving in. On a closer look, it ...
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3answers
104 views

What is this roof constructed from?

I am trying to answer questions about the construction of a roof and was wondering if it is possible to tell from the picture attached, and if so what the construction is? EDIT: The roof is difficult ...
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1answer
2k 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 ...
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23 views

What needs to be replaced for correct eaves / roof edge?

The last homeowner installed a patio roof - connecting support beams to the roof structure. It was a very flat roof -- that had lots of problems. I'd repaired it on multiple occasions - however, ...
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1answer
137 views

Rafter load capacity

I have a 1929 craftsman house with dimensional 2x4 rafters on 24" centers. They're about 13.5 ft long, spanning 11.5 ft each (measured horizontally, wall to ridge beam) at a 7:12 pitch. About 25% of ...
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49 views

Proper shingle placement in corner

I had my roof replaced about a month ago and recently noticed that when it rains, a strong stream of water pours from the roof onto an adjacent window in the corner. In this problem area, I have one ...
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0answers
33 views

12" custom flashing for roof?

We have a section of our garage that sticks out about 12" from the rest of the house and is flat on top- you can see it in the orange section in this photo. The green and blue sections are a boral ...
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0answers
140 views

Ledger/ribbon framing load capacity

We are considering adding a deck to the top of our flat roof detached garage, if the necessary work involved is reasonable. The garage is 20' deep x 28' wide separated into 3 bays, the widest of ...
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109 views

Rear of house has no eves; how do I ventilate and prevent ice dams?

My home is in St. Louis and it just doesn't stay very warm. I am finding that the heat kicks on a lot just so it can keep up. The house is a ranch on a slab, built in 1960, 1073 square feet. In 2015 ...
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0answers
25 views

What's the best way to protect plastic drain waste vent pipes from UV damage on a roof?

What is the best way to protect plastic plumbing waste vents (DWV) where they extend above the roof? PVC discolors and gets brittle in the sun, solid ABS gets chalky, foam cellular core ABS bends ...
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3answers
88 views

Truss Plate Loose where rafters meet

DIYer here. I noticed that (only) one of the truss plates popped off where the rafters meet at the peak of the roof. Thus, a single set of rafters and the supporting beam are misligned and no longer ...
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1answer
89 views

Water leaking behind gutters

I'm a new homeowner and found that water is getting behind my gutters and was hoping someone may have a solution for me. Here's the gutter: Edit: Additional pictures below Video here: https://imgur....
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1answer
40 views

How to demo a partially structural chimney?

Just bought a new home and would like to remove its chimney. It was originally built on the outside of the home and they built a carport up around it. It looks like it may have sprung a leak, so the ...
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1answer
39 views

Improve existing roof insulation from the inside

We have a pitched roof (1971 house, The Netherlands) which consists of (outside to inside): Tiles 2cm PUR insulation 2cm wood We asked a few companies for quotations to improve the insulation (...
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0answers
66 views

Patch a leaking flat roof

We have a flat roof (very low slope) made from gravel and tar, it's a little roof over the porch of the house. When it's raining, the water leaks under the soffit on the right corner, where is the ...
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43 views

How to Approach Fixing a Roof Leak When Drywall is Rotted Out?

My parents house has a leak in the roof that hasn't been takan care of for a few years and has pretty much destroyed the drywall in the affected region. What strategy should I use to repair the leak? ...
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1answer
111 views

Too much water…coming into my downspout

I live in a Townhouse...I'm second in of 4 Units...I'm at the second to highest level and then the unit beside me is higher again. I'm the only unit with a downspout in the backyard...we have ...
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0answers
43 views

Insulating townhouse's attic sidewall?

Last winter, I've had some issues with ice dams on my roof. I live in a townhouse in Southern Quebec, Canada, in the middle unit, where lately temperatures during the winter can go anywhere between -...
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138 views

What is this brown sticky stuff on my soffits?

I recently had my roof replaced and some brown patches started appearing under some of the new plywood. It appears to be dry to the touch, although there are some beads of similarly colored goo on the ...
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0answers
63 views

Building Rafters for OutBuilding

I am going to be constructing an outbuilding for livestock. It will be 32 ft. x 32 ft. I plan to use rafters instead of trusses. Is it OK to use 2x6's with 48 in. OC for the rafters at a 3/12 pitch? I ...
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0answers
24 views

Upgrade Rooftop HVAC

I am planning a rooftop HVAC upgrade. My current HVAC frame (leg) has cracked one of the 2 x 6 roof rafters that I have repaired with wood glue and anchor screws, so it is good now, but it served as a ...
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293 views

Why is this dormer flashing causing a leak?

This roof was repaired about 6 years ago and is now slowly leaking when there is a heavy downpour. The leak is located close to the center point in between the outer wall and the dormer. It is ...
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0answers
48 views

Woodboring insects in roof

I have a roof built relatively recently over a concrete slab. It's a reinforced concrete frame and this is how things are normally done. The roof done with pine wood and then has it has concrete ...
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88 views

How to fix a flashing roof leak?

I have a roof leak. Based on the images below I think it is in the flashing above a small overhang. Please speak up if you don't think that's correct. Can anyone provide some guidance on what to ...
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1answer
267 views

How should I compute the clear span of a purlin in a roofing system?

My house employs purlins to support the roofing rafters. (this video explains almost perfectly what I have in the house). There are two purlins, about 6 feet from each other and the top ridge of the ...
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156 views

How to redirect water pooling behind skylights

I have a pair of skylights in my roof that leak every time it rains. I've tried silicone and a roofing sealant along the edges.. still leaks. During the last storm heavy rain I went up to check it out ...
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1answer
85 views

Some powdery substance on roof rafters

I notice some powder substance on roof rafters in the attic. Its only at few places. Does anyone know what exactly it can be?
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0answers
34 views

galvanic corrosion with anchor point on galvalume roofing

I'm going to add some sort of anchor point, for attaching a safety rope, to my galvalume roof (some sort of shoulder eye bolt, but that is a different discussion). My question, what metal is best ...
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1answer
546 views

attaching eye-bolt to roof ridgeline

I would like to attach an eyebolt to the ridgeline of my metal roof. I can then attach a rope to that when I need to work on the roof. I am a climber and have the knowledge and gear to secure ...
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0answers
61 views

How to determine source of this roof leak?

As Irma pounds our house I was in the attic and noticed we have a roof leak but I can't figure exactly where it is coming from. The obvious place is where that exhaust vent is penetrating, but it is ...
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54 views

What type of mortar should I use to repair a flat flagstone roof?

My garage has a flat flagstone roof. It is around 100 yrs old and is leaking. There are some cracks in the mortar. What kind of concrete mortar mix should I use to stop water from seeping through?
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742 views

calculating waste factor for hip roof w/ valley using cedar shakes

I've been told that my hip roof would result in a whopping 30% waste factor with cedar shakes, that three additional squares of shakes are needed above the amount required to cover the raw square ...
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0answers
43 views

Stucco repair, no membrane?

I was doing a crack repair on my grandparents' house. The crack was in stucco located in an outside soffit on the 1st floor. I removed the stucco and to my surprise there was no membrane, just what ...
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0answers
70 views

Protecting metal shed from rain

My parents brought a large (6*40)metal storage container many years ago. They live in warm weather ( San Diego) but it does rain on occasion on the container leaked. My dad and brother tried numerous ...
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0answers
1k views

Bathroom exhaust fan through clay tile roof

I've installed an exhaust fan in an upstairs bathroom and need to vent it through the clay tile roof. (pic attached) The standard 4" pipe jacks and flashings I'm finding at Home Depot don't seem to ...
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385 views

Split vertical studs need replacement or reinforcement

About a dozen of the short, vertical studs that support my roof rafters are split along as can be seen in the picture. There seems to be some minor horizontal displacement as well. Obviously they ...
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0answers
153 views

Replacing attic insulation

I'm trying to figure out the best plan to replace the failed insulation in my attic. It's a 1.5 story house so it's really a combination floor/attic (see attached diagram). The original insulation ...
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0answers
56 views

How to add/retrofit birdstop to tile roof without removing tiles?

Is it possible to add "birdstop" to the edges of a Spanish tile roof without having to take the tiles off? Is there something on the market that can be screwed to the facia?
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19 views

Shingling a roof with exhaust fan

We are replacing shingles on our roof and need to find out if the covers for the exhaust fans on top of the roof need to be installed before or after the shingles are installed.
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0answers
1k views

DIY Camper, framing advice needed

So my little teardrop trailer plans have changed into a 12'x6' camper so that I can stand in it. I'm in the planning phase still. What I'm doing for the walls is 3 layers; an outer 1/2" board, a ...
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0answers
275 views

What lintel to use above bi-fold doors in man cave?

I'm building a man cave in the corner of my garden, the base is finished already, now I'm planning the build from the ground up The structure will be 2.5 metres high and will have a flat roof (rubber)...
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0answers
79 views

White substance on roof timbers

I've just inherited my dad's house and I've been looking over it's condition, and one of the walls was getting damp when it rains, I had a look in the loft and saw the following: Is this dry rot? It'...
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0answers
2k views

Is it safe to use a blower to clean debris off a shingle roof?

I would like to routinely (once a month) clean the debris (leaves, sticks, pollen, etc.) that collects on my shingle roof because of the shallow pitch: Rather than use a soft broom to brush the ...
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0answers
350 views

Pitch on a patio roof

Recently I decided to re-roof my patio because it has been leaking in several places. That's when I noticed that my patio had very little rain run-off. My patio is 24' wide by 17' deep. The roof ...
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0answers
989 views

Does a vaulted ceiling roof need venting?

I'm buying a house in Colorado, and the house has a vaulted (cathedral) ceiling such that both the plywood sheathing and the ceiling sheetrock are attached to opposite sides of the rafters, i.e. no ...
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0answers
89 views

How to insulate roof from heat (sunlight)

I'd like to insulate roof which is over my flat in 4 store building. MY flat is the last one and every summer is a killer for me as about for 1 month a year I have constant temperature of 30 Celsius. ...
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0answers
47 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 ...
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1answer
745 views

Any alternative to tar paper for roof damage from hurricane?

As a result of Hurricane Matthew, a roughly 12'x4' area on my roof had the shingles blown off. I found the matching shingles today and bought (2) bundles which should be plenty to cover the area. In ...
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1answer
916 views

What's the proper way to flash an inside roofing corner, with self-stick membrane?

What's the proper detail to apply membrane or tar paper to an inside roofing corner, where a sloped roof meets a higher wall at a corner? Of course a metal flashing goes on top of of the membrane, and ...
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21 views

Roof Flashing inside corner

I'm building a structure and putting a roof on it. The roof is single slope 3x12 pitch. Basically it's rectangle platform except where in the middle of the lower edge the roof extends 2 more feet so ...