I-Joists: Difference between revisions
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*Menards - 16" at [https://www.menards.com/main/building-materials/trusses-i-joists-engineered-lumber/i-joists-rim-boards/3-1-2-x-16-i-joist/pji651632/p- | *PJI90 - 16" - $11/foot = $350/32 feet. | ||
*Design guide - [https://cdn.menardc.com/main/items/media/INTER078/Install_Instruct/04-P3-Joist-Installation-Guide-US.pdf] | *Menards - 16" at $134 65 series [https://www.menards.com/main/building-materials/trusses-i-joists-engineered-lumber/i-joists-rim-boards/3-1-2-x-16-i-joist-65-series/pji651632/p-1642874354850390-c-5662.htm]. 28' span for 40 psf live 10 dead, with 16 OC. 130 lb for 32', 100 lb for 24' | ||
*Design guide - [https://cdn.menardc.com/main/items/media/INTER078/Install_Instruct/04-P3-Joist-Installation-Guide-US.pdf]. Chat tells me 90 series is also 7/16" web. [https://chatgpt.com/share/68474287-428c-8010-bff0-231b62b62be2] | |||
**And - flanges are only 1.5" tall and 1.75" wide for the PJI-90 series truss. That means that a 2x4 on the top and bottom is actually stronger [https://chatgpt.com/c/6847424e-0030-8010-aa5c-f56e0be563fb] | |||
=Weight= | |||
*16" deep truss - For 7/16" OSB at 45 lb/sheet - we need 1.66 times sheet including bonding plates. Takes us to 151.5 lb per truss. | |||
*12" deep truss - For 7/16" OSB at 45 lb/sheet - we need 1 = 45 lb in OSB, and 8*9.6=76.8+45+4.5 total of '''128 lb for 32' including bonding plates'''. | |||
=Design= | |||
*34 span for 16" deep I joist (80 series) at 12" OC spacing. [https://cdn.menardc.com/main/items/media/INTER078/Install_Instruct/04-P3-Joist-Installation-Guide-US.pdf] | |||
**{{check}} This is needed for 32' space. | |||
*P3 Series 80 joist - all it says for P3 is that they are '3/8" web or greater' | |||
*P3 80 series is 7/16" web [https://www.google.com/search?sxsrf=ALeKk026QG9BbsZl0rNsBS9KmerMgczY_w%3A1602863734253&source=hp&ei=dsKJX6q8DJDYsAXHkpG4Cw&q=PJI+80+i-joist+web+thickness&btnK=Google+Search&oq=how+to+configure+nvidia+geforce+gtx+1650+super+on+linux+mint&gs_lcp=CgZwc3ktYWIQAzIFCCEQoAEyBQghEKsCMgUIIRCrAjoOCAAQ6gIQtAIQmgEQ5QI6DgguELEDEMcBEKMCEJMCOggILhDHARCvAToLCC4QsQMQxwEQowI6CAgAELEDEIMBOggILhCxAxCDAToFCAAQsQM6AggAOgQIABAKOgYIABAWEB46CAghEBYQHRAeOgcIIRAKEKABUMsQWOmzAWD8tAFoBnAAeACAAeQGiAGhS5IBDTExLjQ3LjMuMi42LTGYAQCgAQGqAQdnd3Mtd2l6sAEG&sclient=psy-ab&ved=0ahUKEwiqz4DcvLnsAhUQLKwKHUdJBLcQ4dUDCAk&uact=5] | |||
* | |||
=OSE= | |||
*Modified [[Truss]]: see design doc [https://docs.google.com/presentation/d/1ULq15Dxa2cPn6gd_Hll4B4Ek0JPToyqJRwYobZZbrwU/edit#slide=id.g30f284b56ad_6_34] | |||
*[[Truss Design]] | |||
Latest revision as of 03:39, 13 July 2025
- PJI90 - 16" - $11/foot = $350/32 feet.
- Menards - 16" at $134 65 series [1]. 28' span for 40 psf live 10 dead, with 16 OC. 130 lb for 32', 100 lb for 24'
- Design guide - [2]. Chat tells me 90 series is also 7/16" web. [3]
- And - flanges are only 1.5" tall and 1.75" wide for the PJI-90 series truss. That means that a 2x4 on the top and bottom is actually stronger [4]
Weight
- 16" deep truss - For 7/16" OSB at 45 lb/sheet - we need 1.66 times sheet including bonding plates. Takes us to 151.5 lb per truss.
- 12" deep truss - For 7/16" OSB at 45 lb/sheet - we need 1 = 45 lb in OSB, and 8*9.6=76.8+45+4.5 total of 128 lb for 32' including bonding plates.
Design
- 34 span for 16" deep I joist (80 series) at 12" OC spacing. [5]
This is needed for 32' space.
- P3 Series 80 joist - all it says for P3 is that they are '3/8" web or greater'
- P3 80 series is 7/16" web [6]
OSE
- Modified Truss: see design doc [7]
- Truss Design