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Posted by Paulaner on August 18, 2008, 6:15 pm
On Sun, 17 Aug 2008 06:41:53 -0700 (PDT), RicodJour
>> Here in Maryland I have a 1700 ft2 1977 rancher that needs new siding.
>> We have decided to use pre-stained cedar shakes on the front of the
>> house (which is also about 40% recycled brick). We are thinking
>> about using hardiplank on the sides (~26') and back (~72').
>>
>> Picture of front: http://mysite.verizon.net/paulaner/139.JPG
>>
>> We currently have 3/8" pressboard siding panels (?), and behind that
>> is light blue rigid foam labeled "Total Wall Insulation Systems". The
>> foam is about 5/8" thick for a total thickness of 1". The windows and
>> doorframes extend about 1" out from the current exterior wall.
>>
>> Picture of window frame:http://mysite.verizon.net/paulaner/011.JPG
>>
>> The old pressboard siding has quite a few soft spots in various edges
>> and personally I think it should be removed before we start the new
>> siding. I don't want to spend extra money if it's not needed, but I
>> want to make sure we have a quality job that we don't have to worry
>> about 20+ years from now. Additionally I want to be certain that I
>> don't lose any insulation, and would be happy to improve that where
>> possible.
>>
>> We are hearing different options from the contractors that have bid
>> the job. One wants to pull the old siding and foam out, install OSB
>> and tyvek, then cedar shakes or hardiplank. One says they can nail
>> the new shakes / hardiplank to the existing pressboard, patching any
>> soft areas as they go.
>>
>> I'm a reasonably adept (inside the house) DIY guy. What I am thinking
>> is to remove the pressboard panels, leave the blue foam installation,
>> nail up ½" OSB, staple the recommended felt and then nail the cedar
>> shakes. Depending on the about of time that takes, I may pay someone
>> to do the hardiplank the same way.
>>
>> What would you do?
>>
>> Any recomendations are appreciated. Thanks.
>
>You could go several different ways, and it all depends on the
>existing condition of the T-1-11 (that's what type of siding you
>have). Hardiplank can be nailed over the T-1-11, you can pull the
>T-1-11 and install the Hardiplank directly over the foam (you have to
>be more careful about over-driving nails and such with that method),
>or you strip the walls down to whatever's underneath the foam and
>start fresh.
>
>I don't know why you'd want to remove the foam insulation,
>particularly with energy costs being what they are.* You probably
>should do a Forensic Siding Autopsy to determine what exactly you're
>up against. Remove one sheet of the T-1-11 in the worst condition and
>disassemble the wall checking for rot, mold and other signs of
>deterioration. That should give you enough information so you can
>determine how to proceed.
>
>R
>
>* Any guesses on how much a cord of wood will go up this year to take
>advantage of all of the other rising fuel costs?
I think the T-1-11 is marginal on most of the edges, so I'm planning
on replacing that with 1/2" pressure treated plywood. I suppose I
could use OSB, but my instinct tells me that it might be better to use
the pressure treated stuff. The goal is to make it last 30+ years so
I can avoid this kind of work during my retirement years.
I called a local insulation shop, and they will send a guy over to
help me look at the current stuff and see if it's adequate. From what
I can tell, the current foam looks to be R-5.
Thanks for your advice,
Pauaner
* I have noticed wood pellets for my stove keep jumping up in cost
every year.
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