The XDP air-permeable underfelt collar is used for easy fitting of the window in conjunction with the EUROTOP air -permeable sheeting used in roof construction.
The sides of the collar are pleated, so that they can be placed directly onto roof battens, regardless of the spacing between them or their thickness. A suitable joining at the corners ensures full watertightness. The air-permeable underfelt collar set includes additional insulating material to be installed around the window. This material is vital as later on there is no possibility to properly insulate window frame sides.
Collars should be chosen according to window size.
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