The style and beauty of a natural cedar roof enhances the appearance of your home. It displays pride as an owner and shows the intelligent sense of value.A cedar shake roof is always durable, resist UV damage and can tolerate the harsh BC weather. The shakes will always remain flat with minimum shrinkage and splitting during its 30 to 50 years of life expectancy.
Cedar shakes and shingles have been used for many years, their warm color and texture will blend in beautifully in any natural environment.
Having a cedar shake roof is an excellent insulator as it can help reduce your heating costs.
A general rule of thumb states that the thicker the shake the longer it will last. This is also true if the shake is hand split rather than taper sawn.
Cedar roof shingles are tapered, smooth and are sawn from a block. They are precisely milled and provide a more refined classic appearance.
There are two types of shingles: sawn and sanded. The sawn cedar shingles have the strength and the general visual properties of cedar shakes. The sanded cedar shingles are smoother on both sides and offer an even more refined look.
Cedar shingles come in two colors either a light brown (untreated) or a green (treated), although after installation they will change to a silver gray.
A treated cedar wood shingled roof has a life expectancy of 50-60 years whereas untreated shingles can last up to 25-30 years.
Installing cedar shingles is more precise as they lay flat and the 3 overlapping layers provide a highly weatherproof system even in extreme weather.
Cedar shake roofs are more rustic look, as they have been split using a mallet and from revealing the natural grain of the wood. The shakes are thicker than shingles and can be uneven in width and length that produces a more textured and varied roof.
Cedar shakes come in two options, hand split and taper sawn. The hand split shakes have a rough outside and this creates a more rustic effect. The taper sawn shakes are sawn on both sides and it retains the thickness and its strength.
Metal and nails.
A properly installed and maintained cedar roof should last 30-50 years. In some cases, roof shingles may last longer than nails used for their installation and/or metal flashings. We strongly recommend that you use high quality galvanized nails when cedar roof is installed, also to use heavy gauge pre-painted stainless steel metal for valleys around the chimney and skylights.
If the spaced sheathing is used in shake application the sheathing is usually 1 x 6 boards spaced on centers equal to the weather exposure at which the shakes are to be laid - but never more than 7 1/2" for 18" shakes and 10" for 24" shakes on roof installations. When 1 x 4 spaced sheathing is installed at 10" on center, additional 1 x 4 boards must be installed (i.e. maximum allowable spacing is approximately 3 1/2" measured from edge to edge between the sheathing boards).
Special care should be taken when installing the felt interlays over spaced sheathing to ensure that an effective baffle is formed. The felt should be applied over the top portion of the shakes and extend on to the spaced sheathing so that the bottom edge of the felt is positioned at a distance above the butt equal to twice the weather exposure.
On shake roofs, it is recommended that a strip of #30 ASTM Designation 226 (ASTM D226) roofing felt be installed over the sheathing and under the metal valley. Metal valleys should be center-crimped, painted, galvanized steel or aluminum and should extend not less than 11" on each side of the valley centerline. Shakes should not be applied with their grain parallel to the valley centerline and those extending into the valley should be cut at the correct angle.
The importance of good attic ventilation beneath the roof cannot be overemphasized. Such movement of air will prevent or inhibit condensation of moisture on the undersurface of the shakes or shingles, or on the roof decks. Vents should be provided at the soffits (eaves) as well as at gable ends (screened to prevent ingress of insects), on the roof by using attic roof ventilation or preferably the ridge lines with cross ventilation desirable. A rule of thumb for adequate ventilation is that the ratio of total net free ventilation area to the area of the attic should be not less than 1:150, with compensation made for screens over vent apertures. In the case of a balanced system, a 1 square foot per 300 square feet of floor area may be adequate ventilation. Attic fans may be beneficial by supplying additional movement of air in attic spaces.
We will apply a 36" wide strip of minimum Type 30 ASTM Designation 226 (ASTM D226) or ASTM Designation 4869 (ASTM D4869) roofing felt at the eave line. An 18" strip of Type 30 roofing felt shall be applied over the top portion of the shakes and extend onto the sheathing. The bottom edge of felt shall be positioned at a distance above the butt equal to twice the weather exposure. Note: felt interlay between courses is not necessary when straight-split or taper-split shakes are applied in snow-free areas at weather exposures of less than one-third of the total shake length.