Mean Roof Height Defined

Maximum allowable mean roof height permitted for buildings with aggregate on the roof in areas outside a hurricane prone region for si.

Mean roof height defined.

It appears there may have been some confusion on the client s part as to the definition of mean roof height. Office bldg flat roof 40 0 with 2 6 parapet. The user can override this value which will alter the pressure but when calculating the windward pressure the original story heights above ground are still used. Roof height mean the elevation located at a point two thirds 2 3 of the distance between the bottom of the roof to the roof peak as measured from the eave elevation.

The picture below shows the pitch of a 7 12 roof slope meaning that for 12 of horizontal measurement roof run the vertical measurement roof rise is 7. For intermediate values of v asd the height associated with the next higher value of v asd. The mean roof height would be the average of 12 plus 22 67 or 17 33 as shown on the building plans. Divide again by the accumulated ridge lengths and you will have the average rid.

For example if your roof is 20 feet wide and has a pitch of 1 2 which means it rises 6 inches in height for every 1 foot of width the height of your roofing surface from base to peak is 10 feet. Office bldg flat roof 40 0 with 2 6 parapet and 10 0 screen wall around roof top units. Per asce 7 what is the mean roof height h of a bldg as follows. Calculate the height of your roofing surface using the width and pitch.

Visually aama tir a15 14 illustrates the mean roof height as per the image below where h on the sloped roof is ridge height eave height 2. Office bldg flat roof 40 0 with 2 6 parapet and 12 0 penthouse penthouse covers only 25 of the roof plan. Enviro buildings modular building 325 payson ave quincy il 62301 tel. Mean roof height asce 7 per asce 7 the mean roof height h is defined as the average of the roof eave height and the height to the highest point on the roof surface except that for roof angles of less than or equal to 10 the mean roof height is permitted to be taken as the roof eave height.

1 mile per hour 0 447 m s. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. The mean roof height would be the average of 12 plus 22 67 or 17 33 as shown on the building plans. In the wind load definition there is a property for mean roof height which is taken as the top story height be default.

It appears there may have been some confusion on the client s part as to the definition of mean roof height. 217 222 5453 or 1 800 728 5454 1 4 2 roof height roof height must be 10 feet 8 inches.