F5 instead of MGP10

Thank you so much for the advise Simeon. Getting it checked again by the surveyors. I have had my builder told me that they tell the engineers what to use. I was surprised to hear that as I was always under the impression that the engineers are qualified to decide on these things not the builders. It seems like the engineers work for the builders to reduce the costs unfortunately

Happy Friday Annoux

I think you are going to find that MGP 10 closer aligned to F7, but you shouldn't be making any changes to your structure with out the engineer signing off on it first, as I dont think you can do a direct swap back from an F grade to a MGP grade.

There might be some additional strengthening needed, more lamination at load points etc. Im not the timber expert so I could be totally wrong


cheers

Simeon

Hey Annunox
The certified engineering details are for MGP10 ( a higher stress grade timber) , the builder will have to go back to their engineers to recertify the engineering for F5
Their Building surveyor is talking nonsense as they aren't licenced to change the original engineering Details without resubmitting new engineering
Also sounds like the builders doesn't want to pay the engineer, who knows what you'll get in the way of F5 grade, most of the timber I'm seeing are Dog house timber -> snook salmon-> john west reject (humour) .... Stand firm that's his problem
Sorry for posting here, but PMs don't assist others in a similar position
cheers
Chris

As mentioned if the construction complies with as1684 then the builder can use this. The correct paperwork must be submitted, whether it be an engineers report or referral to As1684. Now what you didn't mention was were the stud centers different? or was the timber a different size. Either way evidence to show that the design complies with as1684 is what you will need.