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Thread: Fire blocking or Draft stopping
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12-21-2010, 09:46 PM #1
Fire blocking or Draft stopping
Looking for the correct term to use here. From my days as a track rat we called it fire block. Just want to clear this up and get my terms correct in my head.
Image as example.
From IRC 09
Fireblocking. In combustible construction, fireblocking shall be provided to cut off all
concealed draft openings (both vertical and horizontal) and to form an effective fire barrier between stories, and between a top story and the roof space.
DRAFT STOP. A material, device or construction installed to restrict the movement of air within open spaces of concealed areas of building components such as crawl spaces,
floor-ceiling assemblies, roof-ceiling assemblies and attics.
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12-22-2010, 12:58 PM #2
Re: Fire blocking or Draft stopping
Your photo requires fire-blocking.
Picture a house framed with open web trusses with a floor area of 1,200 sf. Draft-stopping is then required to close off the open truss somewhere near the center to divide the 'open' space between the floor and the ceiling into 2 (two) 600 sf areas.
Darren www.aboutthehouseinspections.com
'Whizzing & pasting & pooting through the day (Ronnie helping Kenny helping burn his poots away!) (FZ)
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12-22-2010, 11:41 PM #3
Re: Fire blocking or Draft stopping
Needed that visual, thanks so much.
-marc
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12-23-2010, 05:25 AM #4
Re: Fire blocking or Draft stopping
The most common area I see missing fire-blocking is when a basement is finished with wood studs. The 'concealed' space between the back of the wood studs and the foundation wall AND at the top 'between concealed vertical and horizontal spaces'.
The fire-stopping vertically must be at the ends and every 10 feet, Remember, this would NOT apply if metal studs were used.
This wall is missing fire-blocking.
Darren www.aboutthehouseinspections.com
'Whizzing & pasting & pooting through the day (Ronnie helping Kenny helping burn his poots away!) (FZ)
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12-27-2010, 07:39 PM #5
Re: Fire blocking or Draft stopping
The materials used can be different. Fireblocking is normally 2x material or some combination of 1x wood. It can also be fiberglass or mineral batts used between studs.
Draft stop is really just cutting draft or air movement. Usually from drywall or plywood materials -(not always to resist fire, just subdivide areas). Like an attic or floor space to reduce a large area into smaller areas. While you can also use fiberglass, it's really not used much hear, just because attachment would be too difficult.
Fireblocking is really for small areas between studs, framing etc. Draft stop is for large areas attics, trusses, floor systems etc... hope that helps.
Randy Gordon, construction
Michigan Building Inspector/Plan Reviewer
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12-27-2010, 07:45 PM #6
Re: Fire blocking or Draft stopping
Cool, thanks. Just using the wrong terminology.
Mazza Inspections and stuff...
https://mazzainspections.com
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01-17-2011, 08:43 AM #7
Re: Fire blocking or Draft stopping
Look what I found on my computer!
Darren www.aboutthehouseinspections.com
'Whizzing & pasting & pooting through the day (Ronnie helping Kenny helping burn his poots away!) (FZ)
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