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Plywood and oriented strand board (OSB) are the two most common structural wood panel products used in residential and commercial construction. Both are widely used for roof, floor, and wall sheathing. Although they usually serve the same purpose and meet similar building code requirements, they differ in their manufacture, performance, and pros and cons. Plywood […]
The “Standard Procedure for Field Verification of the Bonding of Mortar or Adhesive Set Tile Systems and Mechanically Attached, Rigid, Discontinuous Roof Systems”, or TESTING APPLICATION STANDARD 106 (TAS 106), is referenced by the Florida Building Code as an uplift test protocol for tile roofs. The scope of this TAS is “…a product application quality […]
Individual roof tiles can be replaced. The document entitled The Facts About Tile Roofs, prepared by the TRI and Portland Cement Association (PCA), states that tile roofs are “easy to maintain and repair” and that “tiles are easiest to repair because they are individually installed.” Additionally, the referenced document also opines that “tile is fast […]
Field tiles immediately adjacent ridge tiles on concrete and clay tile roofs are sometimes skewed. Typically, the bottom edge of these tiles are slightly lifted, and the affected tile are thus not perfectly aligned with adjacent tiles. These tiles are typically sawcut at an upper corner during installation, in order to fit them next to […]
Loose in place roof tiles sometimes slip directly downslope as a result of their unsecured condition and the long-term effects of gravity and thermal movements. This condition often occurs in a mechanically fastened roof where the top of a tile needs to be cut to accomodate a roof vent or other obstruction. Roofers often neglect […]
The condition of mortar set roof tiles being cracked is often the result of foot traffic, material shrinkage, problems with installation and expansion or contraction due to themal and moisture effects. Cracked tiles due to these causes are typically randomly distributed throughout the roof. The Technical Brief #99-002, prepared by the Tile Roofing Institute (TRI), […]
There is often concern over the condition of mortar set roof tiles being loose in place with the bond failure plane between the tile and the mortar (as opposed to between the mortar – membrane). Mortar set tiles become loose for a number of reasons related to original installation, such as improper mixing and application […]
Mechanically fastened roof tiles are also sometimes considered ‘loose’ because they are secured by mechanical fasteners (usually one or two) at their top edge only. An adjacent tile edge typically overlies one edge of any individual tile. However, the limited weights of the adjacent tiles and leverage provided by the length of the tile typically […]
Wind damage to concrete or clay tile roofs typically includes tiles that are displaced, missing or shattered. Wind does not gently pry roof tiles loose and leave them in place and not otherwise visibly affected. Tiles can be shattered during severe windstorms due to tiles from other roof areas displacing and impacting the roof tiles. […]
Refer to the ‘Common Problems – Roofing Issues’ tabs for discussions of wind damage to various roofing types.
