Mean Roof Height Defined

Measure length and height of all ridges multiply height and length of each then add then up and divide by the number of ridges.

Mean roof height defined.

Calculate the height of your roofing surface using the width and pitch. The vertical distance from the lowest existing grade at the wall of the building to the highest point of the coping of a flat roof or to the average height of the highest gable of a pitch or hip roof. 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.

Enviro buildings modular building 325 payson ave quincy il 62301 tel. 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. 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. 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 and 12 0 penthouse penthouse covers only 25 of the roof plan. 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. The mean roof height would be the average of 12 plus 22 67 or 17 33 as shown on the building plans. Office bldg flat roof 40 0 with 2 6 parapet.

Per asce 7 what is the mean roof height h of a bldg as follows. Office bldg flat roof 40 0 with 2 6 parapet and 10 0 screen wall around roof top units. The mean roof height would be the average of 12 plus 22 67 or 17 33 as shown on the building plans. 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.

Divide again by the accumulated ridge lengths and you will have the average rid. 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.