It’s not enough for us simply to refrain from pushing someone off of a roof, we must anticipate and proactively protect against that danger. The parapet requirement provides a practical application of the more abstract principle of –“You shall not stand idly by the blood of your neighbor (Leviticus 19:16).” Beyond demanding that we not perpetrate sins of commission against one another, the Torah now concretely prohibits a sin of omission. This is an intuitive proposition, but we shouldn’t fail to note one innovative implication. We should anticipate that danger and build a railing so no one falls. At a moment in time when houses had flat roofs, the Torah tells us, “When you build a new house, you shall make a parapet for your roof, so that you do not bring bloodguilt on your house if anyone should fall from it.” It’s a simple principle - a flat roof, where family and friends might hang out and barbecue, is an inherently dangerous place. Parashat Ki Teitze offers one of the first instances of building code in human history - the precursor to restrictions on asbestos insulation and circuit breaker requirements. See flat roof advantages and disadvantages.Commentary on Parashat Ki Teitzei, Deuteronomy 21:10 - 25:19 If you're building a large department store, TPO, EPDM, or modified bitumen are your choices. If you're having a new commercial building built, what are you going to be doing in that building? PVC is the preferred choice if you're going to be cooking or it's a auto repair shop as it's resistant to animal fats and grease. A pitched roof would fit right in if you're designing your home to look more modern and traditional. Do they have flat or sloped roofs? Do you want to fit in or stand out? What's the style of your new home? A flat roof is more appropriate if you're going for that mid-century modern look or south western look. If you're building a new home and you're wondering if you should have a sloped roof or a flat one, consider your neighbors. Consider yourself lucky because a flat roof often costs less to build and re-roof. Let's say you have an older home with a flat roof. It won't seal and hold water back, therefore it won't last. The same goes for installing sloped roofing material onto a flat roof. If you have an existing, relatively modern home with a pitched roof, you can't install flat roofing materials onto that roof. It often comes down to (a) whether you can have a flat roof, depending upon the pitch of your existing house or building (see Roofing Material Options for your Roof's Pitch), or, if you're building from scratch, (b) which style you want. It's not a question whether a flat roof is bad or good. Modified Bitumen has the shortest lifespan at 15 years. When properly installed, and depending upon the material used, weather, maintenance, etc., a flat roof should last between 15 and 30 years. Here is a simplified diagram of a commercial flat roof and where it meets the wall (parapet). House with flat roof next to house with sloped roof What are the components of a flat roof? To general contractors and others in the business, we simply refer to the single-ply membrane that's going to be installed onto the flat roof. To our residential customers, we refer to them as a flat roof. Other common names are 'low-slope roof', 'commercial roof', 'single-ply roof' or 'single membrane roof'. What are flat roofs called?įlat roofs are often called just that - a flat roof. Flat roofs were popular on homes built in the 1940's to the early 1970's. Who has a flat roof?Īlthough flat roofs are found most often on commercial buildings, such as hospitals, grocery stores, department stores, etc., you do occasionally see them on houses, apartment buildings, and home additions and garages. Often you can't see the flat roof from the street. What's more, when looking at a commercial building with a flat roof from the street or alley, most often you're looking at the parapet, which is the portion of an exterior wall that rises above the roof. However, a flat roof isn't actually flat. A flat roof appears flat compared to a sloped roof. A flat roof is called 'flat' by comparison to its counterpart, the 'pitched' or 'sloped' roof.
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