# Ceiling joist size.

**URL:** <https://forums.speedlife.net/t/ceiling-joist-size/215931>\
**Category:** NYSpeed Off Topic\
**Created:** [August 27, 2011, 3:33pm UTC](https://forums.speedlife.net/t/ceiling-joist-size/215931 "2011-08-27T15:33:39Z")\
**Posts on this page:** 4\
**Page:** 2

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**Author:** ![1QIKZ](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/1qikz/32/6112_2.png) [@1QIKZ](https://forums.speedlife.net/u/1QIKZ)\
**Post date:** [September 4, 2011, 5:28am UTC](https://forums.speedlife.net/t/ceiling-joist-size/215931/21 "2011-09-04T05:28:02Z")

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> [@TradersBASE](#):
>
> Some of you guys have alot of knowledge I’d like to learn. Ever let anyone do grunt work with you and essentially apprentice once in awhile?  
> I need to gut my bathroom and want some other stuff done to the house but lack the knowledge at the moment. This is stuff I’ve always wanted learn…I only learn hands on though. 8/

PM me.

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**Author:** ![Hass](https://avatars.discourse-cdn.com/v4/letter/h/51bf81/32.png) [@Hass](https://forums.speedlife.net/u/Hass)\
**Post date:** [September 4, 2011, 9:26am UTC](https://forums.speedlife.net/t/ceiling-joist-size/215931/22 "2011-09-04T09:26:27Z")

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> [@Motocrossx23](#):
>
> No harm in using PT lumber indoors, it does not off-gas or leach at all. Why not use regular lumber though? Unless you plan on having a moist and damp attic? It’s not cost effective in my mind to use PT lumber inside unless it’s for a bathroom or garage.

I was just going to use it to see if I can muscle a full length 20 up there, I used the PT boards as floor joists… I have a few leftover.  
I’d use regular lumber if only for the fact that it’s lighter and since I don’t have to use expensive as all hell composite/deck screws.

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**Author:** ![Hass](https://avatars.discourse-cdn.com/v4/letter/h/51bf81/32.png) [@Hass](https://forums.speedlife.net/u/Hass)\
**Post date:** [September 4, 2011, 10:49am UTC](https://forums.speedlife.net/t/ceiling-joist-size/215931/23 "2011-09-04T10:49:41Z")

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Are there are spray foam rental places around here?  
Since all my studs are 18-19"OC, it’s a pita to insulate with regular glass.

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**Author:** ![slo\_ride](https://avatars.discourse-cdn.com/v4/letter/s/49beb7/32.png) [@slo\_ride](https://forums.speedlife.net/u/slo_ride)\
**Post date:** [September 24, 2011, 10:49pm UTC](https://forums.speedlife.net/t/ceiling-joist-size/215931/24 "2011-09-24T22:49:00Z")

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frankly it looks like those 2x4 members are almost entirely in tension due to the roof structure…they should hold up GWB loads without a problem, although if you put storage above i would most certainly sister them up with 2x6’s or more…the biggest problem with old rough sawn lumber is that it is usually dry as hell and loses a lot of its shear strength due to twisting and various nailing and notching over time…

if you really want o know, there are plenty of dimensional lumber charts out there to give you a rough idea of the loading you are dealing with

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