SImilar to this, I have a window scraper with an angled handle, thta accetpts a 
single edge razor. 
I had my house foamed in a similar fashion but I left it. I do not envy you! 
There's probably  a market for pre-cast foam to sit in between I-joists, 
thought that would demand precise framing and, well...
jim
> On Nov 8, 2020, at 2:22 PM, Donald H Locker <dhlocker@comcast.net> wrote:
> 
> I'm not sure which direction you need the offset, but have you
> considered attaching a handle from (e.g.) a mason's trowel to a blade
> holder? Or even just honing the trowel edge to a useful sharpness?
> Perhaps countersink some flathead screws into the face of the trowel and
> use flat washers on top (with wingnuts or such) to clamp the blade?
> 
> Just throwing out ideas here.
> Donald.
> --
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> 
> On 2020-11-08 12:02 p.m., Thomas Coradeschi wrote:
>> All: I am in the process of adding foam insulation to the band joist (in the 
>> joist bays) in my basement. The joists are laminated I-beams, so I am 
>> cutting rectangular blocks of 2â?? foam, and using low expansion foam to 
>> fill the gaps and air seal it all. 
>> 
>> Even with the low E foam, it still ends up oozing out of the gaps, and looks 
>> pretty cheesy, according to the homeowner. It cleans up nicely with a single 
>> edge razor blade, but my knuckles will be a bloody mess (there is a total of 
>> about 150â?? of perimeter) if I canâ??t find a way to trim flush with 
>> something other than the standard blade holder. 
>> 
>> So, I am looking for a holder for either single edge razor blades or drywall 
>> knife blades which allows me to trim flush with some sort of an offset 
>> handle. Iâ??ve look at the box store and Grainger websites, nothing to be 
>> found there. 
>> 
>> Hoping someone has some ideas!
>> 
>> Thanks...
>> 
>> Tom Coradeschi
>> tjcora@icloud.com
>> 
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