Moisture can also come from inside the house, carried into the attic as water vapour by air leakage. Pay particular attention to water marks on the underside of the sheathing or along rafters.įigure 5-2 Some attics are easier to work in than others Typical problem areas include poor flashing at a hip, valley or the chimney and ice dam leaks. Moisture can come from the outside due to failure of the roof or flashing. Identify the cause and correct it before adding insulation. Mould or rot are sure signs of advanced condensation problems. Uncorrected moisture problems will reduce the effectiveness of insulation and can lead to structural damage such as wood rot or split rafters. In addition to checking for structural problems, check the condition of the roof framing, sheathing, finish and the soffit and fascia for signs of moisture problems such as leaks, stains, mould, flaking or rot. Attics or roofs without a working space are covered later in this chapter, in Part 5.4, Cramped attics, cathedral ceilings and flat roofs. Vertical clearances of less than 1 m (39 in.) will not allow you to move freely. Exterior-mounted, gable-end entries represent one less opening that will have to be air sealed, which offers ready access to firefighters in the event of a fire.Ĭheck the roof space for obstructions and ease of movement. If not, or if there is no access, you may be able to cut a hole in the ceiling in an inconspicuous place such as a closet. A hatch should be large enough to allow you to bring in materials. Most houses with accessible attics have an interior ceiling hatch, although exterior roof or wall-mounted entries are not uncommon. A thorough inspection of the following features will help you to develop your retrofit strategy. In the event of a discrepancy in pricing between this website and our store, this store price will be considered the most current and accurate price and will supercede any and all other advertised prices.Regardless of the type of attic or ceiling your house has, there are a number of things to examine before beginning work. Sale prices available for a limited time and while supplies last. We reserve the right to correct printing or technical errors. While every effort is made to maintain prices shown, we reserve the right to adjust prices when necessary and also to substitute or discontinue any item which may become unavailable.
**NOTE** Image not exact each vent sold separately.Perforated design snaps in half for use in both new (24") and retrofit (16") construction.Offers year-round performance by aiding cross-ventilation in summer for increased comfort and reduced cooling requirements, and by helping to prevent ice dams in winter.Break-resistant durability and ease of installation.Vent design assures unrestricted air flow from soffit to attic through thickest part of the insulation.Raft-R-mate Attic Rafter Vents have a high resistance to moisture, which means they will not deteriorate over time. Simply installing raft-R-mate Attic Rafter Vents offers year-round performance and helps to prevent ice dams in winter. When insulating your attic, it is important that you have unrestricted flow of fresh air from the soffit to the attic.
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