[pure-silver] Re: light tight louvered vents

"Sister", in framing parlance, is attaching a second piece of lumber onto an 
original piece. It's usually done when the original beam has been structurally 
compromised. Perhaps the original beam has split. Or a careless plumber or 
electrician has cut into the beam to add plumbing or wiring. Or the original 
beam wasn't strong enough for the weight load it was meant to support.
The problem with sistering a beam is that the weight of the new beam is now 
added into the structure. Depending on the situation, this could be a problem, 
and it may be better to remove the bad beam and replace it with new lumber.
No, I'm not a contractor; I just watch a lot of Bob Vila!
Ken Hart
kwhart1@xxxxxxxxxxxx
  ----- Original Message ----- 
  From: shannon Stoney 
  To: pure-silver@xxxxxxxxxxxxx 
  Sent: Saturday, February 18, 2012 12:47 PM
  Subject: [pure-silver] Re: light tight louvered vents




    Now if your contractor can weigh in on whether we should sister all our 
ceiling joists or just the sagging ones that would be great. ;)


  What does that mean, to "sister" ceiling joists?


  --shannon




    e





----------------------------------------------------------------------------
    From: shannon Stoney <shannonstoney@xxxxxxxxxxxxxxx>
    To: pure-silver@xxxxxxxxxxxxx 
    Sent: Saturday, February 18, 2012 8:31 AM
    Subject: [pure-silver] light tight louvered vents


    I'm building a small outbuilding for my new darkroom. I am planning to use 
light tight louvered vents that you can buy pre-manufactured, from BH 
photovideo or Adorama. My contractor is worried that these won't be truly light 
tight or water proof: he thinks that rain will come through them, or that they 
might not be really light-tight. I was thinking they could go on the south 
exterior wall of the building under the eaves, but he thinks they should draw 
air from  a little vestibule where they can be protected from weather. The one 
I have now IS protected from weather in that way, but I didn't think that it 
had to be.

    Does anybody have any experience with whether these plastic vents are truly 
light tight and water tight when they're on the exterior of a building?

    Thanks.

    
--shannon============================================================================================================To
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