Decks, Patios, Porches and Docks - deck roof...
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short_order
09-13-08, 07:16 AM
I would like to add a roof over my deck. It will be a gable roof with the dimensions 18ft(+ 1 foot over hang each side) and ~13 feet deep. The deck itself is one story above the ground and is 14x~19. The deck is attached to the house via a ledger board with 3 6x6 posts(8 foot centers) and two 2x10 beams running parallel to the house.
To build the structure of the roof I plan on using trusses ~24" on center. The trusses will have an outside wall span of 18', 1 foot over hang each side and ~3/12 pitch. The trusses will be supported by beams connected to a new ledger board and 6x6 posts ~12 foot away from the house.
The 6x6 posts will not be connected to the deck, but will
be placed on top new duplicated support system 3 6x6 posts
with 2x10s tying them together.
I have a couple of questions:
1. I am not sure how to validate the size of the 'beams' that will be perpendicular to the house to support the trusses. The span from the house to the posts is ~10' with a ~2 foot overhang past that. I am currently planning on using 2x6's sandwiched together. Is this enough? Is this overkill for this
type of span? Can anyone point me to documentation for calculating this? Based on some surfing I am assuming a deadload of 10psf a live load of 20psf and a snow load of 30psf( I live Pgh Pa).
2. Legder board size. Does the ledger board size matter? That is does it really matter if I use a 2x6 or a 2x8? Or is that size driven by the size of the beams being connected to it? I ask because I have height restrictions due to a 3rd story window and would prefer to use a 2x6.
Finally I had planned on posting some drawings I made using Sketch-up, but I don't have a host web-site to place them on:(
Any help would be greatly appreciated.
To build the structure of the roof I plan on using trusses ~24" on center. The trusses will have an outside wall span of 18', 1 foot over hang each side and ~3/12 pitch. The trusses will be supported by beams connected to a new ledger board and 6x6 posts ~12 foot away from the house.
The 6x6 posts will not be connected to the deck, but will
be placed on top new duplicated support system 3 6x6 posts
with 2x10s tying them together.
I have a couple of questions:
1. I am not sure how to validate the size of the 'beams' that will be perpendicular to the house to support the trusses. The span from the house to the posts is ~10' with a ~2 foot overhang past that. I am currently planning on using 2x6's sandwiched together. Is this enough? Is this overkill for this
type of span? Can anyone point me to documentation for calculating this? Based on some surfing I am assuming a deadload of 10psf a live load of 20psf and a snow load of 30psf( I live Pgh Pa).
2. Legder board size. Does the ledger board size matter? That is does it really matter if I use a 2x6 or a 2x8? Or is that size driven by the size of the beams being connected to it? I ask because I have height restrictions due to a 3rd story window and would prefer to use a 2x6.
Finally I had planned on posting some drawings I made using Sketch-up, but I don't have a host web-site to place them on:(
Any help would be greatly appreciated.
chandler
09-13-08, 05:31 PM
Upload your sketches/photos on a site such as Photobucket.com and copy/paste the HTML code to a reply post. That way we can see what you see.
short_order
09-13-08, 07:50 PM
Thanks for the idea, I used the photo-bucket website and here
is the link:
http://s435.photobucket.com/albums/qq76/short_order/?special_track=nav_tab_my_albums
Couple of comments on the setup:
1. The 6x6 posts holding up the roof will go through the deck and rest directly on the new joist supports(in red).
2. The current setup has 3 2x6's running to the ledger board connected to the house. Based on the bracket requirements, I would like to limit that to two 2x6's if possible.
3. The 6x6 posts have are sandwiched by 2 2x10's.
is the link:
http://s435.photobucket.com/albums/qq76/short_order/?special_track=nav_tab_my_albums
Couple of comments on the setup:
1. The 6x6 posts holding up the roof will go through the deck and rest directly on the new joist supports(in red).
2. The current setup has 3 2x6's running to the ledger board connected to the house. Based on the bracket requirements, I would like to limit that to two 2x6's if possible.
3. The 6x6 posts have are sandwiched by 2 2x10's.