Per ASCE 7, what is the mean roof height of a BLDG?
Per ASCE 7, what is the mean roof height of a BLDG?
(OP)
Per ASCE 7, what is the mean roof height (h) of a bldg as follows?
1. Office BLDG, flat roof (40'-0") with 2'-6" parapet.
2. Office BLDG, flat roof (40'-0") with 2'-6" parapet, and 12'-0" penthouse (penthouse covers only 25% of the roof plan).
3. Office BLDG, flat roof (40'-0") with 2'-6" parapet, and 10'-0" screen wall around Roof Top Units.
1. Office BLDG, flat roof (40'-0") with 2'-6" parapet.
2. Office BLDG, flat roof (40'-0") with 2'-6" parapet, and 12'-0" penthouse (penthouse covers only 25% of the roof plan).
3. Office BLDG, flat roof (40'-0") with 2'-6" parapet, and 10'-0" screen wall around Roof Top Units.






RE: Per ASCE 7, what is the mean roof height of a BLDG?
RE: Per ASCE 7, what is the mean roof height of a BLDG?
No. 1 the answer is definitely 40'
No. 2 is a bit of a judgement call but with 25% or less being taken up by the penthouse I would still go with 40'.
No. 3 again if its around a few units I would still stick 40'
RE: Per ASCE 7, what is the mean roof height of a BLDG?
You got my point. In ASCE, I did not find any specific section dealing with this issue, if we need to consider parapet/penthouse/secreen wall as a part of building height, to my knowledge. I understand the "engineering judgement call" part. However, I am looking for any documented proof.
RE: Per ASCE 7, what is the mean roof height of a BLDG?
RE: Per ASCE 7, what is the mean roof height of a BLDG?
RE: Per ASCE 7, what is the mean roof height of a BLDG?
That being said, I would consider parapets and penthouses as adding to the "height". I would use 42.5, 45.5 and 52.5.
Mike McCann
MMC Engineering
RE: Per ASCE 7, what is the mean roof height of a BLDG?
RE: Per ASCE 7, what is the mean roof height of a BLDG?
All examples I have ever seen with parapets still use the heigh to the roof level (less parapet) for "h". For example all of the "Guide to the Wind Load Provisions" books. For an online example, see the following: h