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I am renovating..?

a old sunroom .It is in bad shape and needs to rebuilt properly. I need to put a new 2x6x20ft PT ledger board on the house, it going to need (15) 2x6x12 rafters to a 4x6x20 PT beam.The rafters are doug fir, and I need to know how many 4x4 posts I need and there spacing to support it code wise. I looked in a lumber beam conversion table but didn't get it ?

2 Answers

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  • ?
    Lv 7
    3 years ago

    Your code, typically wind and snow loading, defines the strength your structure needs. You first need to determine who is the agency having jurisdiction, typically a city or a county, and contact them regarding code. For a one room repair, some agencies will not bore you with the actual loading to design for, and they tell you how far to space your beams. You may get lucky.

  • ?
    Lv 7
    3 years ago

    Many questions. 1) what type of outside doorway? You may need to use 4x6 posts on outside corners and 4x4 posts every 12'.

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