Solution To Roof Snow Drift

For adjacent drifts we do not start with 4 hdand then possibly increase the width we start with the 1 on 6 shade line.

Solution to roof snow drift.

A sloped metal roof system can be installed directly over the lower flat roof minimizing business disruption. For ordinary leeward drifts the width is 4hd unless hd hcin which case we set the height at hcand increase the width. By elevating driveways above the surrounding terrain wind will sweep snow off of the roadway. Length of roof upwind of the snow drift.

Lets assume our project is in madison wisconsin and we have already calculated our balanced roof snow load here. Usually the roadway should be 1 2 feet higher than the nearby landscape to make this effective. Before building a barrier to prevent the build up of snow drifts such barriers are typically called a snow fence you must assess the area where the snow drifts. Sloped retrofit metal roofing solution for lower roof abrasive roofing materials asphalt shingles or aggregate surface build up membranes do not shed snow as well as slippery surfaced standing seam metal roofing.

If it weren t for those two concerns you could just let the snow pile onto your roof. This is fairly simple to determine even when it isn t snowing. From our example our ground load and flat roof snow load were found to be 30 psf and 21 psf respectively. This approach is conservative and simpler but for small gap the width could be 6 hd.

The second reason is you live in an ice dam prone home and you want to prevent ice dams. Provisions on how to calculate the snow drift surcharge for structures can be found in section 7 8 of asce 7 10. Figure 7 1 pages 84 85 and table 7 1 page 92. The first reason to worry about roof snow is you re worried about a roof collapse.

Determine the direction from which wind usually moves the snow. Length of high roof lu. A longer term solution to drifting snow includes building up roads and driveways so that snow is blown across rather than drifting on to them. To prevent a roof collapse the slope of your roof makes a huge difference.

Ground snow load pg.