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25

I think you will just waste a lot of water compared to the cooling effect that you get. A better way to cool the roof is to change its color. A roof with a clean, smooth bright white surface can reflect about 85% of incident sunlight and emit thermal radiation with 90% efficiency. This surface will be only 9°F warmer than the outside air on a typical ...


17

Replace it now. Like TODAY. That's BAD. With that kind of bad shingle wear, your shingles are likely to create ice dams which will cause water to back up and leak through the roof, causing interior damage, compounding the cost. In the summer, the roof won't hold the water because it can't freeze, so the curls will only grab a very little water before ...


16

Given the choice, I'd put the ladder 2-3' to the side of the downspout. That should allow you to safely reach the downspout and a majority of the problem area without getting off the ladder. Using a stabilizer bar so that you aren't resting on the gutter helps: This also minimizes wear and tear on the shingles. If you do need to walk on the roof, stay ...


15

Trying to brace the roof from the outside as you illustrated will not add any significant structural reinforcement. Without the metal bands, the front and back walls carry the brunt of the lateral load that the roof places on the side walls. Adding straps that encircle the exterior will primarily reinforce the ends, and do little towards stabilizing the rest ...


15

It turns out people have consumed rainwater for millions of years. So there's some precedent. This is very well covered online, so grab a search engine and get reading. Here's a summary of concerns. In the US, it may be illegal (look up "water rights") but for individual home use, that is usually ignored. You'll get a lot of water from your roof really ...


14

I'm a contractor in Maine and we certainly have a lot of experience with ice dams. An ice dam can be the quickest way to force water under the roof shingles even on a roof in good shape. I have had mixed results with heat tapes. When they are used properly, they can be somewhat effective. Most folks expect to see a nice bare zig zag pattern along the edge of ...


14

You lose more heat through ceilings than through other surfaces (because the warm air is touching it, and because of good convection currents). The insulation value of glass is very low. To put it in USA terms, a single pane of glass is R-1, while many house walls are R-20 and ceilings R-30. I've seen superinsulated roofs at R-60. Even triple-pane glass is ...


13

It is common to lay up to three layers (at least in my area), but if the roof has lifting shingles laying another layer will just lift the new shingles. If the roof is bad, it is better and probably cheaper in the long run to remove the old shingles and lay the new ones fresh. If the roof is not that bad a second layer can definitely save money, just make ...


12

On shingles, look for shingles that might be broken, cracked, or missing, that are curled (no longer flat), and any that have lost their stone coating. The last two are important; this is the first sign of an impending roof failure and that your entire roof will shortly need to be replaced. If you have rubber seals around your vent stacks (between the ...


10

It could be that they are trying to slow down a fire from spreading. The material at the edges might be more fire resistant, so the fire will spread to adjacent buildings more slowly, allowing the occupants more time to escape. You might be able to verify this by checking the local fire codes for conjoined (not sure this is the right term) buildings. See ...


10

Twofold theory: Perhaps OSB is cheaper at the moment for this builder than ply and wants to use OSB as much as they can. OSB and Ply are apparently seen as the same in terms of performance and code see: http://bct.eco.umass.edu/publications/by-title/choosing-between-oriented-strandboard-and-plywood/ However, OSB, when cut, is more susceptible to water ...


10

The same policy goes for roof sheathing as for hanging drywall, you get more strength by spanning more rafters/joists/studs and offsetting the joints. This solves two points of weakness. The main one is the structure turning into a parallelogram where the studs are no longer perpendicular to the ground. When you think of using a diagonal brace to support a ...


10

Plywood absorbs water and is not a sealing material, period. You can use it as base for ruberoid roof, but not as the layer exposed to the rain. When exposed to rain, wind and sun plywood will cycle through absorbing water and drying out and this will wear out the most outer layer in no time so that it cracks and the damage then proceeds to the next layer ...


9

I live in south texas, last week we had a terrible heat wave, temperatures outside where in the 110F-115F range, I installed a wireless thermometer on the attic and it read 130F on the hottest days. Ac would not cut off when set at 77. Went to home depot, got a set of 3 sprinklers that you can connect in series, I had an extra 24v solenoid water valve around ...


9

You could be risking damage to the foundation. It depends if the bed is properly graded or not. If the bed is graded properly, the water will run away from the house and the foundation. If not, the water could run towards the house. After a heavy rainfall, see if the foundation concrete close to the dirt looks wet. If it stays wet looking for long after the ...


9

Ok gentilmen , lets talk ice dams. First and foremost, what causes an ice dam to form anyway. Heat trapped in an attic, either from heat loss from the house or sun beating on the roof, cannot escape quickly and melts snow on the roof. This water drains to the bottom of the roof where it runs across a cold edge and freezes. The overhang of your roof (soffit ...


9

It makes complete sense to replace your water heater early, because the failure mode for most of the older ones is "break and drain all over the inside of your house" -- and the 'drip pan' can only catch so much. You don't say where you're from, so I can't give you any climate or region-specific suggestions on what to replace and what not to replace. I ...


9

What you show in the picture is known as a One-way Breather Vent (there are also two-way). Its intended purpose is to provide pressure equalization throughout the roof system and also provides ventilation for the insulation system. In some buildings that do not have a vapor barrier (even some that do), pressure changes inside the building can be forced ...


9

A If you choose B you will dimple the steel, ruining the look while creating a penetration point for water because expansion and contraction of the metal due to heating and cooling will create an open access point for water to enter, and a big opening behind it to receive it. A, however, will give you a tight seal against the wood, wood-steel-screw in a ...


9

I wouldn't worry too much about it. The plywood is not typically supporting a load of more than the paper and asphalt shingles that were placed, even more so if you have a considerable pitch on your roof to where it would be difficult or impossible for a person to walk on. It basically serves so that you have something to nail the shingles down securely. ...


9

As much as you probably don't want to hear this, I am quite sure you are stuck with the job as it is. The time to decide if the sheathing needed to be replaced or over sheathed was when the roof was stripped clean. My first observation is that you said you had 3/8" plywood. 3/8" would be the absolute minimum size, 1/2" or 5/8" T&G would have been ...


9

Leaving the lag bolts in is fine, but the bolts are likely made out of galvanized steel, meaning they will rust and corrode eventually when exposed to constant rain and water. It is best to liberally apply roof cement patch to the lag bolts to ensure that no water will corrode or leak through where the bolts are. You can get roof cement patch in a tube ...


8

You mentioned snow, and that's the only metric i know about. You want there to be more snow. When there is frost, or snow, on your roof - it should not be melting from the heat of your house. The attic is supposed to be insulated, but the roof is supposed to be not insulated. In my (southern Ontario) winters there will be frost on everyone's roof. If ...


8

Up/downs that I'm aware of: Aluminum is more corrosion resistant. Steel is more fire resistant without underlayment. Aluminum is (at least a few years ago) more expensive. There are a couple of different galvanizing techniques used with steel. Understand the differences that apply to your weather conditions. Both roof types will likely outlive you. Both ...


8

Check the ridge tiles - assuming you have them - make sure they're properly fixed on. For slate and tile roofs they should be cemented. Not sure about shingles. Check the flashings where the roof meets any brickwork rising above the roofline. This will be chimney stacks, dormer windows and occasionally parapets. Check that there's no build up of leaves ...


8

Very small pictures, but if I'm seeing them correctly, that's a standard shingle roof which means it'll be over wood sheathing. So no, using a flame cutter would be a substantially bad idea. Unless you want the building to burn down, that is.


8

From somebody who has done this many times, occasionally for money Get help. You can set this up to look rock solid, but no matter how secure you think it is when climbing one wrong move and you're learning to fly in milliseconds. Having a trusted friend or family member hold the ladder at all times is the only way to make this as safe as possible. ...


8

You will need to remove the ridge vent so you can shingle up to the cut opening, and under where the ridge vent attaches. If you can salvage it great, but otherwise, install a new ridge vent. Do not try to mickey mouse your last row of shingles under it to avoid taking it off. You WILL be sorry the first time it rains.



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