The Guide to the different kinds of Flat Roofs. Old materials, and new materials. The GOOD, the BAD, and yes! ... The UGLY.The Guide for the design, construction, maintenance, of Flat Roofs with impervious membranes of different kind."BARE membranes" or TOPPED with different Ingredients, meaning protective materials against direct "SUN RAYS" Choosing the Kind and Materials of the impervious part of roofs. 1 - The conventional and international build-up membranes for flat roofs with 4 or 5 ply/layers of 15 lb (per square) tar paper with hot tar binding and 500 lb of crushed 3/4" diameter stones (per Square) to protect the impervious membrane. ----------------------------------------------------------------- Thanks for asking! What is a SQUARE? 10'ft. X 10'ft. = 100 sq. ft is a SQUARE! --------------- Note: 500 lb. divided by 100 sq ft.= 5 lb. by square foot. --------------- Abstract: PUT a 1 square foot piece of paper on the kitchen table, add on top 5 pounds of crushed stones or gravel. Question? CAN? A - The Roof paper fly away? B - Can the paper bubble-up through the layer of stone on top of it? C - Can the stones fly away if they are 3/4" inch average instead of 1/2" or 1/4" inch diameter? D - Can the stones flow down the roof drains? E - Can the 3/4" inch stone disappear in the hot tar as much as the 1/4" inch stones? Excuse me once again! You ask one question and that what happens! -----------------------------------------------------------------
2 - The Inspection of Roofs with the new 450 lb per square new Synthetic Polymer membranes without a cover of crushed stone to intercept the sun rays. Advantages of different types. The drawbacks of different kinds. The importance of light or dark color membranes. The maintenance and possible IMPROVEMENTS to each kind. The advantage and disadvantages of the material used, the construction of the impervious membranes with each of the materials used. -------------------------------------------------------- 3 – And what happens with NO, or less or too small stones. Detailed photos will be available shortly. See you shortly!
-------------------------------------------- By the way, European Standards in the past for HUGE flat roofs areas without tiles is/was: A SQUARE is 3.2 meters X 3.2 meters = 10 meters square or a ROOF SQUARE. From memory of far far time ago, they would lay 210 kilos to 273 kilos per square on the membranes. This may have to be corrected. ----------------------------------- That is it! To the next time!
André your building inspector. Smile!
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