Checking in tenons

[Aikenback]

We are using standing dead DF with varying mc. (Moisture meter reads 16% at surface but on big pieces up to 35% in the centre after cutting). The timbers the H.O. ordered are already checking when i start cutting. Often the tenons are ok at cutting but by the time i test fit there are checks running through them usually right where i want to drill the peg hole. I end seal everything and or oil stain after test fitting but it seems i have to end seal immediately after cutting. But that leads to my question; is that the best time to end seal considering there may be some work to do at fitting? I have seen pics of joinery where people are using standing dead douglas fir and dont seal at all and the tennons look fine. I leave as much relish as possible but with draw boring the risk of block failure is exacerbated. I have glued with epoxy and used truss mending plates with the peg hole drilled through the plate (after the peg hole drilled through the tenon the mending plate is added on one side and metal holesaw is passed through the tenon peg hole to drill one side. Then flipped and the same process for the other cheek) as a remedy in the past but it is very frustrating. It seems to be common with this wet wood. 

[Jim_Rogers]

You can't stop the check so move the peg hole some place stronger would be an option.

Jim Rogers

PS: End sealer is a wax based paint. it can easily be trimmed off when fitting up. Although it does some times gum up your tools. You may need to end seal right after cutting.

[Don P]

 What is the peg doing, if it is just holding things together for assembly as most are, not a big worry. Essentially you could even strap it for raising and leave the peg out. If the peg is in tension then repair or replace if needed.

Epoxy in a check, a check is a tension perp failure. If the wood is still drying you can glue the checked fibers back together and as soon as the wood dries a little more there will be a tension perp failure at the next weakest fiber, usually right alongside the last one. Does it hurt, no. Does it help, I wouldn't really count on it.

[Aikenback]

All the joinery in this truss is compressed so the pegs are yes just to hold it. It frustrates the crap out of me though. All the comments were considered already....but i was hoping for magic I guess. Haha. Best future solution i suppose is end wax sooner (immediately). Ive been using Heritage end wax. Upon further examination, it seems the pieces that we got fitted, stained and waxed faired a lot better.
Thanks for the input.