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Question DetailsAsked on 6/24/2015

How much to add structural support to top floor deck?

This is a a triple decker in Boston. Under 1000 sq. ft. top floor unit has back deck that is significantly sloping. Inspector said it would need sistering of joists, the ends of the joists are rotting, and L brackets should be installed at horizontal and vertical support beams. This is not a rebuild (but I would be curious to know the costs of that as well), just some structural support. The second floor deck below is also sagging a little. It's not fatal, but if left unaddressed it could be. Haven't been able to get any contractors to quote me without seeing it - which I understand. I don't know the measurements of the deck. Maybe 15 feet long by 7 feet deep? It's a standard apartment building triple decker deck. Hope that's enough info. I really just need a range. Is this $2,000 or is this $10,000?

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1 Answer


wow I cant belive this question you state nobody will give you a price with out seeing it, but wait I'll ask this question over the internet. My suggestion contact a structural engineer in your area.

Answered 5 years ago by the new window man

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