Vented Roof Deck
What are the different types of metal deck venting.
Vented roof deck. Removing moisture from roof cavities structural members sheathing and insulation. Vented metal deck we have installed a metal deck for a roof system on which the engineer has specified a lightweight concrete composite system. We have installed a vented metal decking but the engineer has requested that solid metal decking be used. There are traditionally four main reasons for venting a roof.
Factory side lap vented a roll formed bump at 10 on center on one side of the sheet when the flat edge of the next. The openings for types bv and biv can be specified from 0 5 up to 1 5 of total surface. Venting does not impact the structural performance of the steel deck. Controlling ice damming by keeping the roof cold.
The drawback of venting deck is when concrete is poured the slurry drips through the vent tabs creating debris on the surface below. Enhancing roofing material life span by reducing sheathing temperature. Some materials in the roof assembly may require venting of the steel roof deck such as roof systems with light weight insulating concrete. Deck should not be specified as vented when it is not required.