Underside Of Garage Roof Decking

To provide drainage the panels should slope toward the outside edge of the deck about 1 4 in.

Underside of garage roof decking.

The snugness of the foam itself should be sufficient to hold the strips. Special framing and moisture protection measures can provide mounting points for overhead light fixtures and ceiling fans. The unfinished garage ceiling has 2x4 joists on 24 centers. Picture a cloud of moisture floating overhead between the rafters.

Position the foam board between the rafters and push it upward until it fits snugly against the underside of the roof deck. That excess moisture ends up as drops of condensation on the roof. Essentially condensation occurs at night when the temperature inside a building is warmer than outside. My question is about the unfinished interior of the garage.

As it cools it can t hold as much moisture. I am wondering if it is okay to hang insulation up against the inside of the roof in the garage. The portion of interior ceiling i am concerned with faces west so i thin it would make a difference to the garage temps if i. Plan to space the 2x4 purlins parallel to the house and 3 ft.

The skeleton of a roof is formed with rafters or trusses generally spaced 16 inches or 24 inches apart from the center of one rafter to the center of the next. Adding a sloped sheet metal roof under a deck to make a dry place to store outdoor stuff like the wheelbarrow or kids toys. Under deck ceiling systems provide an all in one drainage and ceiling finish that is particularly suitable for areas beneath a deck that are high enough off the ground to provide a sheltered outdoor living space below. Lower than the purlin along the house 12 x 1 4 3.

To stabilize the rafters support the roofing material and hold the entire roof together roof sheathing is installed. If the span under your deck is 12 ft for example the purlin at the outer end of the deck should be 3 in.