Single Family Roof Deck
Single Family Roof Deck
(OP)
I have a couple of town houses and duplexes that because of their size fall under IBC. They have roof decks/terraces and I would like to design these for a Live Load of 40psf. I am going to hang my hat on the on IBC Table 1607.1, Residential, One and Two Family Dwellings, All other areas = 40psf. Recognizing that the same table lists roof loads used for assembly purposes = 100psf.
Chapter 16 does not appear to define what "assembly purposes" means. Assembly is defined in Use/Occupancy and limits are established, less than 50 people being one exception. However, in that exception, they list the occupancy to be Group B which does not apply.
Is there a clear defensible position to use 40psf for roof decks in a single family home?
Chapter 16 does not appear to define what "assembly purposes" means. Assembly is defined in Use/Occupancy and limits are established, less than 50 people being one exception. However, in that exception, they list the occupancy to be Group B which does not apply.
Is there a clear defensible position to use 40psf for roof decks in a single family home?






RE: Single Family Roof Deck
However, at least in California, you are required to use 1.5 x occupancy served now due to an emergency regulation put into effect. This regulation was a reaction to the Berkeley Balcony collapse.
https://www.documents.dgs.ca.gov/bsc/Info-Bulletin...
RE: Single Family Roof Deck
RE: Single Family Roof Deck
Aside from the long term weathering of the supports, the loading is often not uniform. People congregate at the perimeter of the deck (or rooftop).
I would go with 60-75psi and sleep easy at night.
RE: Single Family Roof Deck
I think that it can be inferred that the AWC position is that ASCE7 requires 100psf.
Our office designs large public decks for 100psf.
We design all other decks for 65-75psf.
RE: Single Family Roof Deck
He designed them at 75 PSF, if the client complained he would suggest designing one that only projected 30".
He was also a stickler for building attachment details.
Joel, reality is even worse, it is everyone running to outside edge of the deck to see what is happening.....
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P.E. Metallurgy, Plymouth Tube
RE: Single Family Roof Deck
RE: Single Family Roof Deck
Dik
RE: Single Family Roof Deck
My condition is not hanging off the side of the building, it's on the roof in a single family home. I should be no more worried with the design live load if the party is on the roof deck or in the living room.