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It protects the roof deck from rain before the roofing is installed. It provides an extra weather barrier in case of blow offs or water penetration through the roofing or flashings. It protects the roofing from any resins that bleed out of the sheathing. It helps prevent unevenness in the roof sheathing from telegraphing through the shingles.
Rosin paper is a heavy duty felt paper.It is used in construction such as underlayment under flooring and siding.In building construction, rosin paper is used to reduce air and moisture flow through a wall or floor, create a "friction barrier" so different materials can slip by each other as they expand and contract, keep dust from working down through a floor, and minimize squeaking.
In earlier days, birch bark was occasionally used as a flashing material. [7] Most flashing materials today are metal, plastic, rubber, or impregnated paper. [8]Metal flashing materials include lead, aluminium, copper, [1] stainless steel, zinc alloy, other architectural metals or a metal with a coating such as galvanized steel, lead-coated copper, anodized aluminium, terne-coated copper ...
Foil-faced polystyrene. This laminated, high density EPS is more flexible than rigid panels, works as a vapor barrier, and works as a thermal break. Uses include the underside of roof sheathing, ceilings, and on walls. For best results, this should not be used as a cavity fill type insulation. Foil-backed bubble pack.
A truss roof with tongue and groove sheathing. The gap in the sheathing at the ridge is the space designed to allow natural ventilation. Pre-manufactured roof trusses come in a wide variety of styles. They are designed by the manufacturer for each specific building. Timber trusses also are built in a variety of styles using wood or metal joints.
The purlins are the large beams perpendicular to the rafters; from this shot, it appears that there are three purlins on either side of the roof. The sheathing boards are sometimes called the roof deck and are painted white. A purlin (or historically purline, purloyne, purling, perling) is a longitudinal, horizontal, structural member in a roof.
A ridge vent is a type of vent installed at the peak of a sloped roof which allows warm, humid air to escape a building's attic. Ridge vents are most common on shingled residential buildings. Ridge vents are also used in industrial warehouses to help release the hot air and help circulate comfortable air inside the building .
Prior to 2013 IS 201-4:2001 ( I.S. 201 part 4: PVC and Low Smoke Halogen Free Sheathed cables for fixed wiring) permitted both the UK style of twin and earth, and also a version with a CPC with a cross-section equal to that of the main conductors and insulated in green and yellow inside the full length of the cable.