Fire blocking in my soffit using rock wool insulation. Basement soffits drops are easy to build using 2x2s and osb plywood.
Qb Tech Alert Vol 2 Issue 8 Fundamentals Of Fireblocking
Code requirements for adding fire blocking and draft stopping apply mainly to new construction.
Fire blocking basement soffits. Tub deck fire blocking is required in the stud bays around a drop in tub. Its the same as if you had a drywalled ceiling. Stairways are another space that fire blocking is required.
This is one of the requirements im dealing with. Here are some examples. Not much to how to build them as you rip the plywood to the desired height which can be determined by the lowest duct height allowing space for framed material under the duct as well.
Fire blocking is for the ceiling space behind your basement walls which im presuming are going to be drywalled. At the intersection of the soffits ceiling horizontal and the walls vertical joint. Fire blocking is a blocking device inserted between the top plate of your exterior wall and the exterior masonry wall.
If a soffit has an unfinished back block off the stud bays at the base of the soffit with 2 by material. Or install 2 by blocking or approved sheathing along the back of the soffit. In concealed spaces of stud walls and partitions including furred spaces and parallel rows of studs or stagger.
The main reason for fire blocking at stairways is to protect the strength of the stairway so it will remain strong as long as possible during a fire so people can get out of the basement or down from up stairs. Its purpose is to prevent the spread of smoke and flames from reaching the bottom of the 1st floor of your home from the basement area. Soffits provide an easy path to floor and ceiling joist bays if theyre not fire blocked.
Where it butts the wall is where the insulation or other approved fire blocking needs to be. There will be a 3 5 space between your concrete wall and the framed drywall walls. There are two main steps to fire blocking a stairway.
As the fire blocking preventing flames from entering the rafter bay. Hi geoff okay heres the deal with fire blocking your basement with a no drywall ceiling. But if youre finishing a basement putting on an addition remodeling a room or just running pipes or wires through a plate youll need to include fire blocking.
What does fire blocking a basement wall involve. Without a soffit the top plate provides the fire blocking. Perimeter basement walls a space behind a 2x4 perimeter basement wall must be separated from the joist bays above.
Fire blocking is not required when the knee wall space is unnished.
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