Clay tile is produced by baking molded clay into tile. The density in the clay depends upon how long and temperature where it's heated. Tiles may be glazed in addition to may have surface texture remedies applied. Consequently, you will discover numerous tile profiles, styles, finishes and colours available. Furthermore, each tile may have separate area, ridge, stylish, gable and terminal tiles of several shapes. Installation techniques depend about the character in the tile being installed that's, be it two piece, one piece, interlocking or flat.
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| Roof system types |
Instance of a clay tile roof
Concrete tiles are built with tigard cement, sand and water in various proportions. The material is mixed and extruded on adjusts under callous. The uncovered the top of the tile may be completed with cementitious material colored with synthetic oxide chemicals. The tiles are cured to offer the needed strength. They frequently have lugs about the undersides for anchoring to batten strips. You will discover additional waterlocks or interlocking ribs concerning the longitudinal edges that decelerate movement and prevent water infiltration.
Much like clay tile, you will discover numerous profiles, styles, finishes and colours available. Color may be put in the top the tile or spread all through (color through). Special texture may be place in surface treatment. Furthermore, each tile type may have separate area, ridge, stylish, gable and terminal tiles that are various shapes.
Roof deck
NRCA indicates tile
be utilized over continuous wood patio patio decking. When plywood may be used, NRCA indicates utilizing a minimum 5/8 thick nominal exterior-grade plywood.
Caution needs to be exercised when roof decks are made in the following materials:
Oriented strand board (OSB): NRCA is worried with potential fastener-holding problems and dimensional stability because of the outcomes of moisture where OSB together with other nonveneer products are used as roof patio patio decking.
Preservative-treated wood: Many roofing material producers recommend wood roof decks be constructed with wood which has been given a nonoil preservative pressure treatment or with nontreated air- or kiln-dried lumber.
Fire-retardant-treated wood: Because of the degeneration of some fire-retardant-treated wood sections triggered by chemical reaction, additional care needs to be presented to investigate using fire-retardant-treated wood panel decks.
For many types of tile roofs, batten and counter-batten systems are employed to hang tile that has mind lugs. Battens are dispersed in line with the length and exposure in the specified tile. Battens needs to be attached for the deck with 8d common, woman, corrosion-resistant nails at roughly one feet on center.
Underlayment
Underlayment (or "felt paper" since it is frequently referred to as) is installed inside the roof deck before using tile. An underlayment works two primary functions: it provides temporary weather protection prior to the tile is installed, also it offers another weather proofing barrier if moisture infiltrates the tile roofing company. Many tile roofs have outlived the underlayment felts these were installed. Therefore, an underlayment's service existence needs to be like the look service existence in the tile roofing company.
Asphalt saturated, nonperforated organic felts are signs underlayments they often are designated as Type 15 and kind 30 or recognized to as No. 15 without any. 30, which are reflective from the once used pound per square weight designation. The terms Type I and kind II now are used within the industry rather than No. 15 or No. 30, correspondingly.
Another type of underlayment can be a synthetic underlayment. It's indicated to become lightweight, water-resistant and less vulnerable to wrinkle getting high tear strength and being easy to walk on-even when wet. Theoretically, the item may be left uncovered for the elements for extended intervals. Although synthetic underlayments in addition to their purported qualities appear appealing, you will discover significant issues to consider before together. So far, you will discover no relevant ASTM standards of those products. Many synthetic underlayments don't meet current building code needs, so producers need to get a code evaluation report for code compliance.
NRCA indicates a minumum of one layer of No. 30 asphalt-saturated felt applied flat in shingle fashion on roof decks getting an incline of 10:12 (40 levels) or maybe more. For roof decks getting slopes of 4:12 (18 levels) around 10:12 (40 levels), believe it or not than two layers of No. 30 asphalt-saturated underlayment needs to be applied flat in shingle fashion. NRCA does not recommend establishing tile roof systems on roof slopes under 4:12 (18 levels).
In locations where the climate for that month of the month of january is 30ยบ F or less, NRCA signifies setting up of the ice-dam protection membrane. An ice-dam protection membrane is really a self-adhering polymer-modified bitumen membrane.
An ice dam protection membrane needs to be applied from a roof's eaves and stretching upslope believe it or not than 24 inches within the exterior wall kind of a building. For slopes under 4:12 (18 levels), NRCA indicates believe it or not than 36 inches. See Figure 1.
Figure 1 - Instance of ice damming
Securement techniques
Many different kinds and blends of securement techniques can be used as the different roof tile. To select a technique for securement, many conditions need to be considered: wind, deck type, seismic factors, slope, building codes, local practices and manufacturer recommendations. Nails needs to be produced from noncorrosive materials that will remain serviceable inside the intended atmosphere for your roof's design existence.
Nails-Nailing is regarded as the common method. NRCA indicates that roofing nails be 11- gauge or 12-gauge woman steel or perhaps the equivalent corrosion-resistant roofing nails. Nail heads needs to be low-profile, smooth and flat. Shanks needs to be barbed otherwise deformed for further pull-out strength. Nails needs to be extended enough to go in through all layers of roofing materials and extend using the bottom in the roof deck or penetrate no less than ¾ inch into wood plank or board decks.
Wire tie and strapping systems-Hanging tile with wire may be used on non-nailable decks, insulated decks or where fastening through metal flashings should be avoided.
Clips-Nose or butt clips sometimes are used together with other attachment approaches to high-wind or seismic areas.
Carry-hung-tile-Several types of tile have produced undersides near their heads that could be hung about the batten. Carry hanging tile usually may be used along with other securement techniques.
Bedding Tile-Relaxing tile in the bed mattress of mortar of foam adhesive is normal in a few parts of The U . s . States where freeze/thaw the elements isn't experienced. Bedding frequently may be used along with other securement techniques.
Flashings
Flashings for tile roofs come under four groups: perimeter edge metal, penetrations, valleys and vertical surfaces. See Figure 2.
Perimeter edge metal-regarding the severity of climate, anticipated rain and freeze-thaw cycling, using perimeter edge metal is highly recommended.
Penetrations-plumbing soil stacks, exhaust vents and pipes are showed into tile roof systems with some type of flat flange that stretches around a transmission which is installed under shingles concerning the upslope from the flange.
Valleys-valleys which are classified as "open valleys" are often lined with sheet metal.
Vertical surfaces-each time a roof system abuts a vertical surface, you will discover four types of flashing generally used: apron, step, cricket (or backer) and counterflashing.
Figure 2 - Fundamental sheet metal flashing components
Apron, step and cricket flashings require some form of counterflashing to cover and safeguard the most effective edges from water invasion. Oftentimes, the wall covering or cladding material functions as counterflashing. If this does not occur, metallic counterflashing mounted for the vertical surface needs to be installed. See Figures 3,4 and 5 permanently good examples.
Figure 3 - Instance of metal counterflashing inset in masonry mortar joint
Figure 4 - Instance of through-wall metal counterflashing a part of masonry mortar joint
Figure 5 - Instance of surface-mount metal counterflashing
Material standards
NRCA does not make any recommendations about which tile or manufacturer to take advantage of however, NRCA does recommend clay tile roof covers meet American Society for Testing and Materials (ASTM) Standard C1167, "Standard Specs for Clay Roof Tiles."
Presently, you will discover no ASTM standards for concrete tile.
Warranties
When purchasing a completely new roof system, you will notice two warranties to consider. First, you will notice the manufacturer's warranty. Generally, these warranties cover defects inside the creation of the roof covering. Please read NRCA's consumer advisory bulletin addressing roofing warranties for more information. Once the project is complete, make certain the contractor provides you with certificates for that records.
Second, the roofing company gives you a warranty covering his workmanship. Typically, this could cover installation and related issues. The warranty should contain what items are covered and what is going to void them. Most companies offer one few years years of coverage however, there is no industry standard.
