Romex between furring in finished garage.

[JFletcher]

That makes sense. Looks like I am going to be drilling for awhile.

Any suggestion regarding a good auger bit for true 2x8 that are pretty well seasoned? ( about 50 years)

Nope. I recommend several cheap paddle bits and write them off. Auger bits generally drill crappy, ragged holes. A new tr-flute wont, but they are pretty pricey and impossible to get level between joists. You shouldnt hit any nails in the center of a joist. It's still wood, not granite. :happyyes:

If the structural engineer says only 1 1/8" holes max in the center, go with that. 2 x 8s are not suitable for a floor load even new, and especially if the plumber has already hacked them up for a water line.

 

[JFletcher]

The SE wants the width of the joist as spacing between holes so one hole every 8"

I'd still drill it per his specs before stapling underneath. He's probably CYA but I probably would too in this instance.

 

[Nicksab]

Nope. I recommend several cheap paddle bits and write them off. Auger bits generally drill crappy, ragged holes. A new tr-flute wont, but they are pretty pricey and impossible to get level between joists. You shouldnt hit any nails in the center of a joist. It's still wood, not granite. :happyyes:

If the structural engineer says only 1 1/8" holes max in the center, go with that. 2 x 8s are not suitable for a floor load even new, and especially if the plumber has already hacked them up for a water line.

I agree regarding the 2x8. the SE had us add triple LVL and quadruple LVL under most of the walls which makes it even harder to get anything up in the wall

 

[Nicksab]

I'd still drill it per his specs before stapling underneath. He's probably CYA but I probably would too in this instance.

All SE are CYA . I may try to talk him into getting that spacing reviewed specially on some of the short span joist.

 

[Nicksab]

Here is what I am looking at. If that make any sense

 

[JFletcher]

I agree regarding the 2x8. the SE had us add triple LVL and quadruple LVL under most of the walls which makes it even harder to get anything up in the wall

Oh, Laminated Veneer Lumber is NOT the same as dimensional. It is engineered wood. I'm pretty sure your structural engineer is getting his info from this table:


http://internationalbeams.com/wp-content/uploads/2012/12/TB-LVL-4.pdf

This does change everything.

The original 2x8's were probably designed to be a minimally loaded ceiling, then someone wanted to put a floor on it. and people and furniture. maybe a baby grand or a waterbed. Not gonna work. So along comes your SE who realizes this, and sticks tri and quad LVLs everywhere to try to fix the issue.


as far as getting up into a wall, drill at a fairly agressive angle and nailplate w/e winds up too close to the finish.

 

[James L]

Wow, that s a lot of holes

Yeah, it was for all the home runs in a new house, and AHJ wouldn't allow any more than 2 wires in a hole, regardless of hole size (bundling). That's why he was there, I called to have a pow-wow about the number of holes, thinking 6 larger holes would have been better.

When I drilled all those holes, I kept them as low as I could because I was drilling with a long auger and didn't want the struggle of pulling through all the holes angling uphill.

Well, AHJ measured every hole, and found 3 of them were less than 2" from the bottom of the lumber. I had to pull all those home runs back out of the panel and across the basement so carpenters could double 2 joists, then i had to pull them back in again.

I wanted to throw up.

That's why I say call and ask somebody who has the authority to make an executive decision.

 

[infinity]

Yeah, it was for all the home runs in a new house, and AHJ wouldn't allow any more than 2 wires in a hole, regardless of hole size (bundling). That's why he was there, I called to have a pow-wow about the number of holes, thinking 6 larger holes would have been better.

Another guy making up his own code. :slaphead:

 

[retirede]

That makes sense. Looks like I am going to be drilling for awhile.

Any suggestion regarding a good auger bit for true 2x8 that are pretty well seasoned? ( about 50 years)

I like the Bosch Daredevil spade bits. Not too pricey and they pull themselves through the wood - saves a lot of manual pressing on the drill.

 

[Little Bill]

Yeah, it was for all the home runs in a new house, and AHJ wouldn't allow any more than 2 wires in a hole, regardless of hole size (bundling).

Your AHJ was wrong unless you had a local amendment. I hear the "no more than two" argument all the time and most have it wrong. First the code says that more than two in a hole that is going to be fire stopped then you derate. It never says you can't have more than two, it just says if you do then you have to derate. You could have up to four before the derating would bring you below the 15A or 20A threshold.

In fact, if the hole isn't going to be sealed or in contact with thermal insulation, then I don't see where there are any limitations on how many could be in a hole.

Show him this next time!

334.80

Where more than two NM cables containing two or
more current-carrying conductors are installed, without
maintaining spacing between the cables, through the same
opening in wood framing that is to be fire- or draft-stopped
using thermal insulation, caulk, or sealing foam, the allowable
ampacity of each conductor shall be adjusted in accordance
with Table 310.15(B)(2)(a) and the provisions of
310.15(A)(2), Exception, shall not apply.

 

[James L]

Your AHJ was wrong unless you had a local amendment. I hear the "no more than two" argument all the time and most have it wrong. First the code says that more than two in a hole that is going to be fire stopped then you derate. It never says you can't have more than two, it just says if you do then you have to derate. You could have up to four before the derating would bring you below the 15A or 20A threshold.

In fact, if the hole isn't going to be sealed or in contact with thermal insulation, then I don't see where there are any limitations on how many could be in a hole.

Show him this next time!

This was long time ago, late 90s or early 2000s

And I agree there's much confusion. However, some municipalities adopt a code cycle and leave interpretation solely in the hands of the field inspector.

 

[JFletcher]

I like the Bosch Daredevil spade bits. Not too pricey and they pull themselves through the wood - saves a lot of manual pressing on the drill.

Self-feeding bits also waste cordless batteries, tho to each their own. I for one will never dig out, re-chuck, or abandon a self feed bit stuck in wood again.

 

[Dennis Alwon]

In fact, if the hole isn't going to be sealed or in contact with thermal insulation, then I don't see where there are any limitations on how many could be in a hole.

Show him this next time!

I agree with you if it is just one hole and no insulation or fire caulk, however, if you have a bunch of wires running thru a hole for more than 2' then I would consider that bundling.