08:55AM | 05/31/05
Member Since: 05/30/05
1 lifetime posts
I have built a 20' X 30' deck that I left my rail posts high for a future roof. I'm thinking of building a shed style roof so my questions are pretty easy.

1. What size ledger board should I use?

2. What size trusses should I use? I've been told 2 X 8's.

3. Do I need to support the trusses with another board that is attached to the house? Like a second ledger board?

4. I also have a 2 X 12 pitch, live in southern MD. I've also been told to use ice paper for my roofing paper. Is this true?

5. Does anyone have a rough drawing to show me the pieces needed for making the roof?

Thanks, JB


06:07PM | 06/05/05
Member Since: 11/06/02
1284 lifetime posts
big pile of information missing here in all this ...

20x30 which way?

20' out from house?

with no idea what the live load required by local jurisdiction for snow and wind, no engineer can calculate what size rafters you need.

Rafters are what you want for add-on like this. not russes necessary. for a 20' span you are likely to need 2x12 or some wood I-joists. yards that sell them can do the engineering free if they get the idea yuou know what you are doing. installation of wood I-joists is very specific in its detailing.

ledger board is the name of the board attached to the rest of the house for the joists used as rafters to perch on.

Ice paper??? A peel and stick underlayment called bituthene or Ice and Water shield is probably what you are talking about. Whether to use it depnds on what sort of roofing you will use. I would not put shingles on a 2/12 roof. Even with the bituthyene it will leak eventually. There are mineral surfaced roll products that are also peel and stick, all in one. Polyglass is one.

drawing? Have to start with what you have now first to design this for you.

Frankly, given the sounds of things, you do not have the skills needed for this project and could end up getting somebody hurt. Hire a pro

Excellence is its own reward!



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