• Commercial Description
   • Technical Description

Plystone: Roof Decking

Technical Description

Roof decks are classified in accordance to both its internal appearance and the type of finishing to be used as final roofing material:

• Asphalt Tile Base. Plystone boards offer a flat, firm and level surface over which to lay the asphalt underlayment that serves as waterproof membrane and sweat sheet or vapor barrier for the asphalt tiles or shingles. No additional support structure is required. Application of the asphalt shingles or tiles should be in accordance to the manufacturer’s instructions.
• Clay or Cement Tile Base. Traditional clay tiles, widely used in many countries in our area can be installed on Plystone sheets after installing a layer of asphalt felt or vapor barrier. If tiles are directly supported on Plystone boards, it should be verified that the working loads do not exceed the permissible support capacity of the boards; otherwise deformations are to be expected. A structural assessment has to be performed to determine the necessity of building an additional substructure to transmit the load to the main structure. In such case a transversal substructure is to be built that will act as direct support to the roofing units or tiles thus transmitting the load to the main structure.
• Metal Roof Base. Similar to the previous case, once the Plystone boards are in place to work as base, it becomes necessary to build a transversal substructure to act as direct support to the metal roofing sheets that are available in the market.
• Exposed Roof Base. This is the case when the designer wants to take advantage of the Plystone board and use it as ceiling. Here the smooth side is placed face-down and will be visible from the interior of the building.
• Non-exposed Roof Base. Here, an independent ceiling will be built and therefore the lower face of the roof decking will not be visible from the interior of the building. A space is created between the ceiling and the decking which can be used to run diverse installations, ducts and lay insulation blankets.