The Forestry Forum is sponsored in part by:

iDRY Vacuum Kilns


Forestry Forum
Sponsored by:


TimberKing Sawmills



Toll Free 1-800-582-0470

LogRite Tools



Norwood Industries Inc.




Your source for Portable Sawmills, Edgers, Resaws, Sharpeners, Setters, Bandsaw Blades and Sawmill Parts

EZ Boardwalk Sawmills. More Saw For Less Money!

STIHLDealers.com sponsored by Northeast STIHL


Woodland Sawmills

Peterson Swingmills

 KASCO SharpTech WoodMaxx Blades

Turbosawmill

Sawmill Exchange

Michigan Firewood, your BRUTE FORCE Authorized Dealer

FARMA


Baker Products

ECHO-Bearcat

iDRY Wood Lumber Vacuum Drying for everyon

Nyle Kiln Dry Systems




Author Topic: T&G pine on purlins?  (Read 607 times)

0 Members and 1 Guest are viewing this topic.

Offline Rjwassink67

  • member
  • *
  • Posts: 21
  • Location: Eastern NC...retirement NW PA
  • Gender: Male
  • learning all I can
    • Share Post
T&G pine on purlins?
« on: March 13, 2019, 01:47:15 PM »
For my ceiling, I plane to use T&G pine on my purlins.

1.  Won't dirt/debris work its way through the grooves as it moves around from swelling and shrinking or is this not a problem?   Should I cover the top of it with drywall or some other product?

2.  How far can 1x6 T&G go unsupported without sagging? 3', 4', 5', more?  There will be fiberglass insulation and some can lights on this as well as additional weight.

I will have independent trusses above the ceiling supporting the roof, so the timber frame will be

  a stand alone system.

Thank you!

Offline Mike W

  • Full Member x2
  • ***
  • Posts: 180
  • Age: 50
  • Location: Boundary Washington - Right on the edge of the Northern Boarder
  • Gender: Male
  • I'm new!
    • Share Post
Re: T&G pine on purlins?
« Reply #1 on: March 13, 2019, 09:34:58 PM »
Rjwassink67,

If you are concerned with dirt / debris migrating through the T&G during normal movement, you could always install a vapor barrier such as Tyvek or Felt to build a dust barrier below the insulation on the purlins prior to the T&G installation.  Whatever you decide ensure if there is moisture barrier on the upper section of the roof structure you use a breathable material such as Tyvek or other to prevent encapsulating the area which would cause any latent moisture to grow mold, the envelope needs to breath.  Best is eave and ridge venting to allow the hotter days / cooler nights to have their way with the envelope and yet can out gas any condensation buildup. 

as for the T&G 1x6 no problem spanning the 5' distance as the T&G are self supported along each edge at 6" intervals the entire length of the run, it builds a diaphragm of sorts, just without shear properties, your roofing sheathing will accomplish the shear needed of the roof structure.

The insulation and light cans will not hinder the above statement.

Mike

Online Don P

  • Senior Member x2
  • *****
  • Posts: 5996
  • Location: Southwestern VA
  • Gender: Male
    • Share Post
    • Calculator Index
Re: T&G pine on purlins?
« Reply #2 on: March 13, 2019, 10:08:46 PM »
An air barrier is the biggest thing with T&G to keep air from moving through it. Can lights are typically a chimney through that air barrier you can often drive through neighborhoods on frosty mornings and spot the unfrosted areas above can lights.

I'm curious about the order of construction here?
A laborer works with his hands
A craftsman uses his brain and his hands
An artist uses his brain, his hands, and his heart

Offline Rjwassink67

  • member
  • *
  • Posts: 21
  • Location: Eastern NC...retirement NW PA
  • Gender: Male
  • learning all I can
    • Share Post
Re: T&G pine on purlins?
« Reply #3 on: March 14, 2019, 08:26:23 AM »
An air barrier is the biggest thing with T&G to keep air from moving through it. Can lights are typically a chimney through that air barrier you can often drive through neighborhoods on frosty mornings and spot the unfrosted areas above can lights.

I'm curious about the order of construction here?
Funny you should mention the order of construction, I'm also thinking about that as well!  Right now: timber frame, trusses, roof (to dry in as soon as possible), T&G - just slide them in from the sides, if I do drywall (but I like the tyvek idea) slide the sheets between the purlins as we go.  This is will be a tight fit between the timber frame and trusses but should be ok.  My bents are 10' on center and I may go 5' on center for the purlins.  So i will be able to take a full sheet up flat.
So I should place the tyvek printed side against the T&G?  This will slow air movement, but would it trap moister against the T&G?

Offline Ruffgear

  • Full Member
  • **
  • Posts: 68
  • Age: 43
  • Location: New London MN
  • Gender: Male
  • I'm new!
    • Share Post
Re: T&G pine on purlins?
« Reply #4 on: March 14, 2019, 11:18:18 AM »
Seems like an odd way to do things to me. Is your timber frame not structural? If not, why not put t&g to bottom of rafters and put faux timber frame on inside?

Offline Rjwassink67

  • member
  • *
  • Posts: 21
  • Location: Eastern NC...retirement NW PA
  • Gender: Male
  • learning all I can
    • Share Post
Re: T&G pine on purlins?
« Reply #5 on: March 14, 2019, 06:26:00 PM »
My timber frame will not be structural.  I want the room above in the trusses for insulation.  I also don't want the really high cathedral ceiling to save on heating area. I need/want the pitch of the roof for our snow load.  I have never liked the look of faux timber frame.  They rarely look great.  I would put the T&G on the rafters and my trusses up against it, but I was instructed on this forum to NEVER attach the timber frame to the trusses.  This is the reasoning behind my different approach.  If I'm way off on my thinking I would love to hear the responses.  Thanks all

Offline flyingparks

  • Full Member x2
  • ***
  • Posts: 160
  • Age: 33
  • Location: Ward, CO
  • If my dog doesn't like you, I don't like you.
    • Share Post
Re: T&G pine on purlins?
« Reply #6 on: March 14, 2019, 06:31:05 PM »
Have you thought about SIPs? May be a good option in your case. Timber Frame, T&G, SIP, Ice and Water Shield, Roofing. Next to bullet proof

Offline Rjwassink67

  • member
  • *
  • Posts: 21
  • Location: Eastern NC...retirement NW PA
  • Gender: Male
  • learning all I can
    • Share Post
Re: T&G pine on purlins?
« Reply #7 on: March 14, 2019, 06:43:20 PM »
I don't want the high cathedral ceiling that I would end up with if I used SIPS.

Offline flyingparks

  • Full Member x2
  • ***
  • Posts: 160
  • Age: 33
  • Location: Ward, CO
  • If my dog doesn't like you, I don't like you.
    • Share Post
Re: T&G pine on purlins?
« Reply #8 on: March 14, 2019, 06:50:59 PM »
Then I'm confused by your drawing. But reading previous posts you said that your timber frame I non-structural. So are your structural trusses going to be a steeper pitch?

Offline Rjwassink67

  • member
  • *
  • Posts: 21
  • Location: Eastern NC...retirement NW PA
  • Gender: Male
  • learning all I can
    • Share Post
Re: T&G pine on purlins?
« Reply #9 on: March 14, 2019, 07:27:04 PM »
Yes, the trusses will be steeper.  I don't know the numbers yet, but maybe 9/12 outside and 6/12 inside pitch in the scissor truss.  The timber frame would be designed to just fit inside, maybe 5.5/12.

Offline Hilltop366

  • Senior Member x2
  • *****
  • Posts: 2507
  • Location: Nova Scotia
  • Gender: Male
    • Share Post
Re: T&G pine on purlins?
« Reply #10 on: March 14, 2019, 07:30:58 PM »
How about timber frame then T&G boards then vapour barrier then a layer of foam board or two then trusses and more insulation between trusses? The layer of foam board will really help with thermal bridging through the trusses and condensation on the vapour barrier.

With all this new LED lighting there is probably a light fixture that you can install on the ceiling in a pancake box that depending on the thickness may not even go through the T&G, this may be a better option.

Online Don P

  • Senior Member x2
  • *****
  • Posts: 5996
  • Location: Southwestern VA
  • Gender: Male
    • Share Post
    • Calculator Index
Re: T&G pine on purlins?
« Reply #11 on: March 14, 2019, 08:34:18 PM »
As long as the truss designer knows where the bearing is I would question the NEVER.

If the spans can be handled by stick framing I would tend towards overframing it with dimensional lumber rafters. Sparky is not gonna be happy.

You could also do scissor trusses in TF with T&G on top of the lower chord.
A laborer works with his hands
A craftsman uses his brain and his hands
An artist uses his brain, his hands, and his heart

Offline Ruffgear

  • Full Member
  • **
  • Posts: 68
  • Age: 43
  • Location: New London MN
  • Gender: Male
  • I'm new!
    • Share Post
Re: T&G pine on purlins?
« Reply #12 on: March 16, 2019, 10:10:01 AM »
As far as the lighting goes. As don mentioned cans can be problematic if not insulated correct. They now have LED that go in standard box and look just like cans. We're seeing a lot of those now.
I now understand your building approach a little better, but I'm still thinking there should be some refining.

Offline Ruffgear

  • Full Member
  • **
  • Posts: 68
  • Age: 43
  • Location: New London MN
  • Gender: Male
  • I'm new!
    • Share Post
Re: T&G pine on purlins?
« Reply #13 on: March 16, 2019, 10:12:32 AM »
Have you seen tule peaks timbers?

Offline Rjwassink67

  • member
  • *
  • Posts: 21
  • Location: Eastern NC...retirement NW PA
  • Gender: Male
  • learning all I can
    • Share Post
Re: T&G pine on purlins?
« Reply #14 on: March 16, 2019, 07:17:46 PM »
Have you seen tule peaks timbers?
Nice!  I will be sawing my own.  


Share via delicious Share via digg Share via facebook Share via linkedin Share via pinterest Share via reddit Share via stumble Share via tumblr Share via twitter

xx
Cutting Purlins

Started by mmhailey on Timber Framing/Log construction

10 Replies
3194 Views
Last post February 27, 2011, 06:15:44 PM
by Dave Shepard
xx
Purlins, how many of you dovetail them and how many don't?

Started by Thehardway on Timber Framing/Log construction

10 Replies
3819 Views
Last post December 02, 2007, 09:19:34 AM
by Don P
xx
poplar for purlins?

Started by two saw on Sawmills and Milling

10 Replies
2895 Views
Last post March 15, 2007, 02:38:45 PM
by scsmith42
xx
Long Purlins

Started by dail_h on Sawmills and Milling

7 Replies
2966 Views
Last post September 18, 2006, 07:31:12 PM
by dail_h
 


Powered by EzPortal