b"Important tips: Similar to the sealant gun, it is critical that you balance the movement of the foam gun or straw barrel and how you dispense the foam so that thefoam makes contact with both the rough or existingwindow frame and replacement window frame. If the dispensed foam does not make contact withboth the rough frame and the window frame, therewont be an adequate bond to seal out water and air. Industry Standards suggest application of 1 inchbeads, separated by an equal space. Be careful not to create two vapor barriers - one at the exterior andone at the interior. Make sure there is the ability forthe opening to breathe to the cold side for drying anddrainage. Use backer rod about one inch in the sill asa stop to make a workable back dam When applying foam around the perimeter of the window or door, you must maintain a minimumdepth of 1 inch. This depth is required to provide the correct thermal performance, to help improveenergy savings, and to protect against condensationproblems.Using Spray FoamWhen applying foam as a back dam to the gapFor the best installation, it is necessary for the gap between the window frame and the rough sill, do around the window or door to be sealed to block out not allow the foam to extend to the exterior edge ofair, water and vapor penetration. ccSPF can do that the opening. Maintain a minimum of a 1 inch gapwell if selected and used properly. Improper use can between the foam and the exterior edge of the roughcreate water traps, impede drainage and exert exces- sill. If foam fills this gap at the sill, any water fromsive pressure to the window frame during expansion.leakage will not be able to drain to the drainage planeRemember: Vapor barriers need to applied on the or exterior cladding surface. Place backer rod thewarm side of the opening. Double vapor barrierslength of the sill, 1 from edge and use it as a back(one on the warm side and another on the cool side) dam guide.encourage condensation between and will trap theresulting condensation. Also, window installation Foamcavities (the space between the window frame andBeadthe rough opening, or left-in-place old window frame)need to breathe to the outside, and allow drainageof collected water to the outside.AWDI recommends ccSPFFoam which is apolyurethane closed cell, low pressure/low expansionsealant to fill the gaps as protection against moistureand air. OSI's closed cell foam also achieves a thermal performance of R5 per inch.ApplicationFoam can be applied using a Foam Applicator Gun, Backer Rodor a small can with straw type nozzle tip The flexi-ble tip from gun or can equally allows for more pre-cise application. This gun offers a rear valve used tocontrol the size of bead applied into the openings.The valve also allows the life of the foam tobe extended by closing the opening of thebarrel for future use.For even smaller openings, a detachablescrew on top is included with the gun to Foambe able to fill gaps as small as 1/8 1Set Back Beadwide.Window Fitters Guide to Window Installation162020 AWDI, LLC Do not reproduce without permission"