How to secure chimney wall brackets to fiberboard wall

How to secure chimney wall brackets to fiberboard wall

PostBy: MattFoley772 On: Thu Oct 03, 2013 2:55 pm

I've found nothing in any manual or anywhere online to address this. Installation instructions just say "attach wall bracket to wall securely." Uh, ok, thanks.

Planning to install chimney through wall and up side of house. SS chimney wall brackets must be installed every 8' to secure chimney to exterior house wall. Problem: wall is aluminum siding over 1/2" fiberboard (built mid 60's), fiberboard is nailed to wall joists. Unlike plywood I do not trust fiberboard to hold any nail or screw; this stuff is basically compressed cardboard. Also, chimney might need >2" from wall to get around roof edge. The farther away chimney is from wall the more stress on wall attachment points. Also, chimney isn't centered between wall joists (comes thru cinder block wall downstairs).

Note: the chimney will be secured at the following points:
on a tee support at bottom,
at this wall bracket in question,
at another wall bracket at roof level,
and finally a roof brace.
Total chimney height is 20'. These other attachment points will be secured to wood or concrete and are not a problem.

Ideas:

a) Alternatives to screws/nails, like toggle bolts or anchors? They would be ok thru wood or drywall but again this fiberboard is pretty flimsy--are there such anchors designed for fiberboard specifically? And even if this is secure how secure are the nails holding the fiberboard itself to the joists? I don't want a 60mph wind pulling the chimney, bracket, siding, and fiberboard off the joists. Unlikely, perhaps, but I want to be sure.

b) Attaching a piece of 2x4 against siding with lag bolts into wall joists, then attaching bracket to the 2x4. But I'm concerned about moisture and wood rot.

I'd love to hear your ideas.
MattFoley772
 
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Re: How to secure chimney wall brackets to fiberboard wall

PostBy: dcrane On: Thu Oct 03, 2013 8:05 pm

welcome to the forum Matt! The fact is... You clearly have the right handle on what your doing (frankly 99% of the folks in the world would not know all that you have stated in your thread here). I think you know the concerns, I think you know your comfort level regarding the securing of your stainless chimney, I also think you are in the best position to make the determinations for the job... I would go ahead and erect the chimney with the known secure points (after this done, you will then have a much better feel for what will make you satisfied that its strong and secure). The 2x4 to studs is obviously the strongest (maybe you will comfortable with only one attaching point in the middle of the run like this? or maybe you can use channel iron or a piece of Teak if rot concerns you, my guess is P/T up in the air like that will outlive the stainless & coal combo anyways)...

It sounds like someone like you could help others who are not as mechanically inclined or well thought out or articulate :up: we love having folks like you as part of our forum here ;)

Post up some pics and let us know how you handled it when your done... we would love to see!
dcrane
 
Hand Fed Coal Stove: Crane 404

Re: How to secure chimney wall brackets to fiberboard wall

PostBy: MattFoley772 On: Thu Oct 03, 2013 8:24 pm

Dcrane, thanks. I refuse to believe no one else in the U.S. has encountered this since fiberboard is pretty common in older homes. Unless a better idea comes up I think the 2x4 is the way to go. Siding is white so I think I'll paint the 2x4 white so it blends in and protects against moisture. Will give update when finished.
MattFoley772
 
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Re: How to secure chimney wall brackets to fiberboard wall

PostBy: 2001Sierra On: Thu Oct 03, 2013 10:45 pm

You could even ease the edges with a router, and take some of the utility look away from them. Also if the siding is beveled cut them so the bevel is not evident, you are on the right path.
2001Sierra
 
Hot Air Coal Stoker Stove: Keystoker 90 Chimney vent
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Other Heating: Buderus Oil Boiler 3115-34
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Re: How to secure chimney wall brackets to fiberboard wall

PostBy: franco b On: Thu Oct 03, 2013 10:46 pm

If you have access to the attic then you might be able install a 2x4 between studs to fasten to. That's the point of most stress at close to roof level. You can use steel angles meant for that for stronger nailing than toe nailing.
franco b
 
Hand Fed Coal Stove: V ermont Castings 2310, Franco Belge 262
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Re: How to secure chimney wall brackets to fiberboard wall

PostBy: Wiz On: Fri Oct 04, 2013 5:27 am

:idea: locate wall joists. screw 2x4 horizontal on wall joists then attach pipe with bracket onto 2x4.
Wiz
 
Stoker Coal Boiler: Keystoker Ka 6
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Re: How to secure chimney wall brackets to fiberboard wall

PostBy: michaelanthony On: Fri Oct 04, 2013 7:33 am

Is there a window close by to reference framing from the interior, a partition wall, electrical outlets? In some places the studs will be doubled and dependent on the framing tripled so with the right fasteners and siliconized caulking you should be able to do a clean and simple install. :) Good luck
michaelanthony
 
Hand Fed Coal Stove: Vigilant 2310, gold marc box, vogelzang pot belly coat rack
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Re: How to secure chimney wall brackets to fiberboard wall

PostBy: freetown fred On: Fri Oct 04, 2013 7:48 am

If studs are 16 on center--make some brackets that will hit them attachment wise---what do you need 2 or 3???? OR---you could just rebuild the whole house ;) KISS
freetown fred
 
Hand Fed Coal Stove: HITZER 50-93
Coal Size/Type: BLASCHAK Nut/Stove mix

Re: How to secure chimney wall brackets to fiberboard wall

PostBy: MattFoley772 On: Fri Oct 04, 2013 10:23 pm

No access to wall framing; wall bracket will be halfway up the living room wall (finished inside and out). Only way of attaching 2x4 is against the siding and lag bolting it thru predrilled holes through siding and fiberboard into 16" studs.

Going up, the next bracket will be into gable end roof rafter. Above that will be roof brace. Those two are no problem.

Tonight I installed the tee support into cinder block wall using 8 1/4" x 1.5" lag bolts and lag shields. That support ain't going anywhere.
MattFoley772
 
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Re: How to secure chimney wall brackets to fiberboard wall

PostBy: freetown fred On: Fri Oct 04, 2013 10:35 pm

There ya go:)
freetown fred
 
Hand Fed Coal Stove: HITZER 50-93
Coal Size/Type: BLASCHAK Nut/Stove mix

Re: How to secure chimney wall brackets to fiberboard wall

PostBy: MattFoley772 On: Thu Oct 10, 2013 2:47 pm

Update:

Thanks for all your suggestions. Chimney installation is complete.

Starting at bottom:

1. Tee support attached to cinder block wall with 8 lag bolts and lag shields.

2. First wall bracket lag bolted to 2x4; 2x4 is lag bolted through siding/fiberboard into wall studs. First, I drilled hole through siding and fiberboard, then fed stiff wire in to feel where stud is, marking this point on siding with felt tip marker. Next, drilled holes 16" apart into studs. Next, sealed hole with silicone sealant. Next, lag bolted 2x4 against siding into predrilled holes into wall studs. Next, attached bracket to chimney. Note: previous day I applied 2 coats of acrylic paint to 2x4 to match white siding and to protect from weather.

3. Second wall bracket is lag bolted to roof rafter.

4. Roof braces are lag bolted through roof into attic 2x4s. I pressed against top of chimney and it feels very secure.

Sealed all bolt entry points with silicone II sealant.

Checked chimney for plumb as I added each piece and after each bracket/brace.

I am confident this chimney will be secure in any wind. Even with generous sealant applied I'll go into attic and check for leaks.
MattFoley772
 
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Re: How to secure chimney wall brackets to fiberboard wall

PostBy: MattFoley772 On: Thu Oct 10, 2013 3:30 pm

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MattFoley772
 
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Re: How to secure chimney wall brackets to fiberboard wall

PostBy: freetown fred On: Thu Oct 10, 2013 3:37 pm

Nice MF :)
freetown fred
 
Hand Fed Coal Stove: HITZER 50-93
Coal Size/Type: BLASCHAK Nut/Stove mix

Re: How to secure chimney wall brackets to fiberboard wall

PostBy: michaelanthony On: Thu Oct 10, 2013 7:20 pm

Way to go Matt!
michaelanthony
 
Hand Fed Coal Stove: Vigilant 2310, gold marc box, vogelzang pot belly coat rack
Coal Size/Type: Pea, and a little nut
Other Heating: Very cold FHA oil furnace

Re: How to secure chimney wall brackets to fiberboard wall

PostBy: oilman On: Thu Oct 10, 2013 7:58 pm

nice work.
oilman