You'll notice on bigger buildings there is generally a bigger roof pitch. If your roof is partially blocked by obstructions, such as trees or higher structures surrounding your house, less snow will accumulate on it. Solar panels. If your house has been snowed under, the weight of the accumulated snow may cause the structure to show signs of overstressing. Many manufactured homes come with a 3/12 roof pitch but some can be upgraded to a 4/12, 5/12 or greater. If you want to calculate these values by hand, use the following formulas: The result - snow load, or the pressure exerted by the snow - has the units of kN/m² or lbs/ft². As you already know, ice has a substantial density and causes a lot of stress on the structure. As you might expect, buildings of high importance, such as power plants, schools or hospitals need to be more snow … Be especially careful when ordering a home in cold climates, as the local jurisdication may dictate an unusual roof pitch and more often than not, a much higher "roof load" to handle the weight of potential snow. Visible signs of overstressing. If you just push it over the edge, be very careful that it doesn't land on people passing by or on cars, as the effect is similar to a small avalanche! Since Canada frequently experiences heavy snowfalls, it's essential to know how much snow load your roof can withstand. Each manufactured home must be designed according to the federal Manufactured Home Construction and Safety Standards at 24 CFR 3280, commonly called the HUD Code. SOURCE: http://greenottersmanufacturedhomereviews.blogspot.com/2011/12/all-about-eaves-roof-pitch-and-roof.html. This downward imposed load on the home is also known as the snow load. In areas with high snow fall, sometimes insurers will require that you have at least a 4/12 pitch on your roof. In our calculator, you can choose the exact location by firstly selecting the province or territory you live in, and then specifying the city. roof load capacity. Self weight will be a uniform distributed load, and will also have to be included for design of beam AB. On the other hand, snow that stayed on your roof for a few days will settle and, while it seems that the cover gets thinner, its weight doesn't change - it's just the density that is different. The North Zone design live load equates to 40 pounds per square foot, the Middle Zone equates to 30 pounds per square foot, and the South Zone equates to 20 pounds per square foot. The maximum weight of snow allowable on your roof depends mostly on the location of your house. Usually pitches of 5/12 come only on modular homes with hinged roofs, so they can be transported within height limits. You need to supply the following information: Length and width of your roof. Openings in Floor/Roof Plans Openings in a horizontal system usually are framed on all sides. And while not everyone has experienced Alaskan snowfalls such as the record-breaking 78" in 24 hours in 1963, we all know that a sudden blizzard may leave your house covered in a thick layer of snow. If you attempt to bring in a mobile home that does not have the required minimum for a roof pitch, they can block you from installing or moving into your new home. It is something you have to pay attention to in areas with snow. Please remember that the numbers given by this calculator are just an approximation and are by no means 100% accurate. Insulation. Homes in non-snowy areas usually come with 20 lb. You can enter these values in any units you'd like, including meters and feet. If you're not sure which type to choose, always settle for the wetter types, as they are denser. Until now, you probably shoveled your roof irregularly, or when it seemed about right. = live roof load W = wind load S = snow load E = earthquake load R = rainwater load or ice water load T = effect of material & temperature H = hydraulic loads from soil F = hydraulic loads from fluids. The HUD Code stipulates, at §3280.305(c)(3), that the home shall be designed and constructed to conform to one of three roof load zones. In areas that receive heavy snow, the roof pitch may be so extreme that snow slides right off the structure, negating the need for shoveling and manual snow removal. In areas where you might get 2 or 3 ft. of snow, you should upgrade to the 50 lb. Regrettably, we are only permitted to offer our investments to accredited investors at this time. All rights reserved. Temperature in the building. Slipperiness of the roof. All the information is taken directly from the ATC Hazards website. © 2017 Manufactured Housing Institute. Unless you're lucky to live in sunny California, you probably know the never-ending plight of shoveling heaps of snow from your roof every winter. You might wonder why do we fuss around with all these calculations instead of recommending you to remove all snow immediately after every snowfall. It's always better to be on the safe side! Our calculator allows you to choose the state you live in, and - in the case of Alaskan locations - the specific city. The lack of eaves and a shallow (not steep) roof pitch are often design features that distinguish a manufactured home from a conventional home. roof is recommended. A snow layer covering solar panels is not dangerous, but it prevents them from working properly, as sunlight cannot reach them. Roof loads are a downward (vertical) force on the home. LOADS ON BUILDINGS AND STRUCTURES 2.1 INTRODUCTION 2.1.1 SCOPE This chapter specifies the minimum design forces including dead load, live load, wind and earthquake loads, miscellaneous loads and their various combinations. Even if our calculator claims that the current snow cover isn't dangerous for the structure, a sudden snowfall at night can change the situation dramatically. The roof is flat and a crane lifts it up and it is unfolded into place on site. It also informs you whether you should immediately remove some of the snow, or you can wait a little bit longer. While all manufactured homes are built in a factory, not all roof pitches will be the same! Above is a chart showing the angle of various roof pitches. If your roof is located in windswept areas (or even north of the treeline), the wind will cause snow drifting, making less of it accumulate on your roof. If the roof seems damaged, don't attempt to clean it, as it might collapse - instead, contact a structural engineer to assess the scope of the problem. http://greenottersmanufacturedhomereviews.blogspot.com/2011/12/all-about-eaves-roof-pitch-and-roof.html. Basing on the roof parameters you specified in the first section, our snow load calculator displays the maximum allowable snow cover thickness and snow weight. Once you know these values, our snow load calculator automatically finds the total weight of snow on your roof. An often overlooked (literally) feature of your new mobile home is eaves and roof pitch. For example, modular homes often carry a 5/12 roof pitch. As you can see in the table below, its density is over 15 times higher than the density of fresh snow! Roof exposure. Make sure to not wait for too long, though! As you might expect, the roof a building placed in a windswept, mountainous area will accumulate a different quantity of snow as a house in the middle of a city. However, a South Roof Load Zone home cannot be installed in either a Middle or North Roof Load Zone. Here, each square foot of roof system delivers 50 pounds of live load and 15 pounds of dead load (65 psf total) to the structural support system. On larger homes a 16” eave adds a look of substance to the home. You should also consider where to put all the snow from your roof. If your roof is pitched, enter the length and width of the flat area covered by the roof. Slipperiness of the roof. This downward imposed load on the home is also known as the snow load. Snow cover thickness. The weight of snow is measured in kg or lbs. If your roof is located in windswept areas (or even north of the treeline), the wind will cause snow drifting, making less of it accumulate on your roof. snow weight = length * width / cos(pitch(°)) * snow load. Additionally, icicles hanging over your head are dangerous for passerbys - they might fall on somebody's head! When removing ice from the edge of your roof, shovels or hammers won't prove overly useful. Rock salt may damage your roofing tiles and corrode metal elements such as gutters or nails. Roof load (live load) design is affected by the shape of the roof whether it is flat, curved or pitched. Schedule of Permanent Loads commonly found in Residential Properties. Less snow will accumulate on a slippery roof - it will slide off instead. If ice forms on your roof, remove it immediately. You can enter this value either as a ratio x:12 or as an angle, whichever suits you better. And, more importantly, where should you store all of it? It means that if your house was constructed before 1988, it might not comply with these regulations - in such a case, make sure to take the results from this calculators with a large pinch of salt! In heavy snow areas, where you might get 5 or 6 ft. of snow on the roof, a 90 lb. Regardless of the recommendations of this snow load calculator, there are some cases in which you should always remove the snow from your roof. If you live in the US, our snow load calculator compares the total weight on your roof with the permissible load calculated according to the standards issued by the American Society of Civil Engineers regarding the Minimum Design Loads for Buildings and Other Structures (ASCE7-16). The maximum weight of snow allowable on your roof depends mostly on the location of your house. The exterior wall (and the headers within) will carry all loads from the mid-point of the house (between the supporting walls) to the outside of the house (including the roof overhang).