Betty asks…
Do I need to remove shingles on a valley end of a gable roof?
Hi,
I am building my new garage. It has a gable roof with a valley attaching to the existing roof. My question is when I frame the valley, and add the support for the rafters onto the main roof. Can I just place the support wood onto the roof without removing the shingles? Or should I remove them?
Thanks for your time.
pb4sc
admin answers:
I would remove them, otherwise,the old shingles will deteriorate with time, and allow play between the new,and old construction.Also.the asphalt in the old shingles could start to run in the new airless setting.Remember,this will be attic space,essentially,and temperatures will be much hotter than the outside of a roof.
Linda asks…
is it necessary to reroof a house with 2 layers of shingles or can they be removed & new shingles installed?
40 yr old house on L.I. NY contract want to remove old 3/8in. sheathing, replace with 1/2 in. Removing nails from old deck would weaken it not support new layer of 30 yr. arch. shingle??
admin answers:
You can always put new shingles over existing , they are usually easy to remove.
I would want to see what the sheeting was like under the existing. Will be a nicer looking roof with all new shingles and you can repair any of the sheeting as needed.
Steven asks…
what size beam would be needed to support a span 20′ hip style shingle roof for carport (south LA no snow)
note this is will be a carport so the 20′ span needs to be open (no center support)
admin answers:
5 1/2″ X 15 1/8″ X 20′ laminated beam should be sufficient. I’m building a house in south Louisiana and have a span of 22 1/2′ (under my carport) that is being supported with no center beam and this is what I have. The engineers were perfectly ok with it.
Lizzie asks…
Number of posts needed to support porch roof?
I would like to add 20 ft. partial porch (think craftsman style, a shingled half-wall instead of railings). How many columns are needed to support this span?
admin answers:
The number size & spacing of the suports depends entirely on the depth / strengh of the header spanning them.
Just as an example, have an open porch approx 40′ long & 8′ deep supported by 6, 4″x 4″x 8′ posts & the “header” is doubled up 2″x 8″ s w/ a max span of about 10′.
Told that each post is good for approx 1000 lbs .
The structure was OKd & takes into account expected snow loads.
The American Wood Council site has figures for beam sizes
for loads over length of span.
Going to need a permit, so you or contractor must submit a design to the building inspector & see if it meets local codes .
Best regards
Mary asks…
Uneasy about roofing with coated metal shingles over wood shake?
I am planning to place a steel shingle roof over a wood shake roof.
I will add a 1 1/2 inch insulation blanket with radiant foil in between the 2 by 2 supports.
Two questions.
Does leaving the shake under the steel make the roof more susceptible to fire
Should the foil on the insulation go up or down. If up it is touching the steel. If down it is a 1/2 inch above the shakes.
admin answers:
The foil should always face the out side, and I don’t believe you would be in any more danger of a fire them what you had already been.
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