Wedge Anchor OVERKILL or NOT?
Wedge Anchor OVERKILL or NOT?
(OP)
This seems to be wedge anchor OVERKILL.
Currently erecting a 20’x51’6”x19’H Quonset hut.
Q-Hut manufacturer concrete design spec’s minimum 2500 PSI @28 Days.
Anchor bolt detail spec’s ½”x5.5” HILTI KB-TZ’s.
If concrete does not retain equal or greater value of anchor, why would design professional spec HILTI verses say, RED HEAD with similar strength value to concrete?
Not a state or government project, home owner garage.
I just don’t get it. Cost difference I do get.
Same project drawing spec’s 6”x6” W.W.R. in slab, only rebar spec’d schedule 40 18”oc stubbed out of footing 2’ into slab.
I always use grade 60 because I can buy for same price as grade 40. Rebar is obviously more costly than W.W.R... In my opinion, w.w.r. doesn’t do anything anyway. Always ends up mashed down below concrete pour.
This just doesn’t make sense to me.
Busy Building,
H2ohound
Currently erecting a 20’x51’6”x19’H Quonset hut.
Q-Hut manufacturer concrete design spec’s minimum 2500 PSI @28 Days.
Anchor bolt detail spec’s ½”x5.5” HILTI KB-TZ’s.
If concrete does not retain equal or greater value of anchor, why would design professional spec HILTI verses say, RED HEAD with similar strength value to concrete?
Not a state or government project, home owner garage.
I just don’t get it. Cost difference I do get.
Same project drawing spec’s 6”x6” W.W.R. in slab, only rebar spec’d schedule 40 18”oc stubbed out of footing 2’ into slab.
I always use grade 60 because I can buy for same price as grade 40. Rebar is obviously more costly than W.W.R... In my opinion, w.w.r. doesn’t do anything anyway. Always ends up mashed down below concrete pour.
This just doesn’t make sense to me.
Busy Building,
H2ohound






RE: Wedge Anchor OVERKILL or NOT?
Even garages need to follow the building code. But if you get a 90 mph gale, leave the house and go to your Quonset hut.
RE: Wedge Anchor OVERKILL or NOT?
RE: Wedge Anchor OVERKILL or NOT?
RE: Wedge Anchor OVERKILL or NOT?
As for the rebar, Grade 60 would be fine. As for WWR being mashed down, then you need to get a competent installer that will chair up the mesh to where it needs to be and not mash it down.
If you want cheap, go cheap. If you want it done right, sometimes it costs a bit more.
RE: Wedge Anchor OVERKILL or NOT?
How much will you save by making the change versus the cost of the time spent negotiating the change and the faffing around before the negotiation to collect the information.
Be grateful that they gave you a design. change it and you take on the responsibility for the design.
Michael.
"Science adjusts its views based on what's observed. Faith is the denial of observation so that belief can be preserved." ~ Tim Minchin
RE: Wedge Anchor OVERKILL or NOT?
RE: Wedge Anchor OVERKILL or NOT?
Mike McCann
MMC Engineering
RE: Wedge Anchor OVERKILL or NOT?
Well, Grade 40 steel is a lot easier to cut and bend than Grade 60. We quit using W.W.M 40 years ago or more. We use rigid mesh or bars and always on dobies.
Garages are open structures and can have sometimes a tendency to fly - especially if the doors are open in a very strong wind.