Lag Screw into End Grain of a 2x8???
Lag Screw into End Grain of a 2x8???
(OP)
I’m looking into possibly requiring the installation of a ½” diameter lag screw into the end grain of a 2x8.
Obviously I have several concerns regarding this:
1. Constructability: I’m concerned that when the lead holes for the lag screws are drilled, the contractor will damage the 2x8. Would requiring an epoxy screw help to mitigate any damage?
2. Has anybody had experience with this type of connection?





RE: Lag Screw into End Grain of a 2x8???
How is the lag being loaded? Attaching into end grain should be avoided. For either shear or withdrawl the NDS provides a cooresponding C(eg) factor (end grain factor)
Jordan
RE: Lag Screw into End Grain of a 2x8???
The withdraw load on the anchor is approximately 80 pounds, the shear load is approximately 100 pounds. I'm also installing masonry epoxy bolts for the ledger, which will take some of the shear load.
RE: Lag Screw into End Grain of a 2x8???
Jordan
RE: Lag Screw into End Grain of a 2x8???
Thanks for the response! Do you know what section (or page#), addresses the combination shear/withdrawl into endgrain?
Any experience with epoxy bolts into wood? Do you think it would be a more durable connection, as compared to a lag screw?
RE: Lag Screw into End Grain of a 2x8???
Ceg = 0.67 into end grain. For a lag bolt in end grain Fem=Fe(perp)
I have no experience with epoxy bolts into wood. Check with the manufacturer rather than creating a solution.
Good luck!
Jordan
RE: Lag Screw into End Grain of a 2x8???
RE: Lag Screw into End Grain of a 2x8???
I also would recommend, avoid lagging to the end grain if possible.
RE: Lag Screw into End Grain of a 2x8???
I'm using them to attach a fascia to cantalevered 2x6's so it can be installed from the roof (difficult to get to the face of the overhang, 26 ft above ground on a hill).
RE: Lag Screw into End Grain of a 2x8???