The boot is then cut to the appropriate diameter for any given pipe. A preferred embodiment of the invention may best 'be understood from a study of the following specification when taken in conjunction with the attached drawings wherein: Here again, the curb base sides extend to the next natural seam and mates to the roof panel by lapping over the rib, making the curb an integral part of the roof system. The boot is fabricated from a flexible, gasket-type of material. The curb itself will be made by the unit manufacturer specifically to fit the unit you buy. Choosing the right Roof Curb pdf. For decent cooling air distribution you have to get the air outlets up high, so you have a lot of fittings in the ductwork as well as a straight run that's substantially longer.
If the width of the watershed flashing does not exceed mm it has the length restriction as other flashings. Cyril John Kanunski, Broadv1ew,lll. The ends of the ribs should be closed, but not sealed, to allow ventilation and to disperse any condensation draining into this space. However, some penetrations are already in place before the roofing contractor shows up. Where the use of metal cladding is unsuitable for multi-penetrations alternative materials should be considered. The copper base flashing extends a maximum of 4" onto the roof.
In the case of pipe 32, the cut boot has two steps with a first or larger diameter truncated cylindrical section 34 matching upstanding cylinder 24 and a second or smaller diameter cylindrical section The curb cover has a vertical apron 21 ending in a fiared portion 19 which forms a drip edge. Rubber roof warranties can get voided by having the wrong people messing with them, and that's not something you want to become liable to the owner for. Designers and tradespeople should have an understanding of the mechanism of the corrosion process to comply with the requirements of this section of the Code of Practice. There are two conditions under which a different design of penetration flashing may have to be considered. The chemical resistance is especially important since it enables the cap or cover to stand up under the attack of high pollution impurities found in many cities.
Sheet 1 is full length. Its a square foot concrete block bay, the walls are filled with insulating type stuff. The specifier and contractor should follow any manufacturer's specific installation requirements, any certification or appraisal conditions, and this Code of Practice to comply with the NZBC. However, it is his responsibility to inform those persons who are concerned of the likelihood of deterioration from runoff if inappropriate materials are used. The curb 12 itself might be made from metal, plastic, wood or other suitable materials. By enclosing the collector, all the pipes are protected from the weather, which eliminates the dissimilar metal contact with or runoff onto the metal cladding. A roof or wall penetration such as a dormer or a vent acts as an obstruction to the rainwater flowing off the roof.