Owner Builder Forum
Nov 19, 2018 6:12 am
As an OB I am designing an extension on an old 1900s Jarah framed house. (now brick veneer)
I will replace the colonial hipped roof with a gabled roof and add a floor on top + dormers.
My question is, are there any guidelines to help minimise fees for certification and engineering sign offs.
I need engineer sign off on a retaining wall and the new roof will be pitched 45 degrees. Also, a new floor on top of existing jarrah frame.
At the moment, I am designing in Revit and will generate tables of windows, and also data for calculation of racking on roof envelope.
I am very limited on how much I can afford for engineering and certifcation so I am hoping to keep these fees to a minimum if possible.
Re: How to minimise building certification & engineering fee2
Nov 20, 2018 9:44 pm
The guidelines for engineering design certifications have tightened with the introduction of the Engineers Act in the eastern states.
BTW i usually have a chuckle, when designers & architects tell me what revit can do..Let me tell you what it can't do (as stated) , that is, check & certify the structure. It pretty much does everything else, quants, materials, dynamo, etc
Here's a Bim Summary
C Purlins for a loft floor
If you are on a tight budget you might want to consider truss frames for the attic
If you put your revit model up or leave a PM I'll take a quick look.
On a 45 deg pitched roof you also might want to consider a bay dormer window
Re: How to minimise building certification & engineering fee3
Nov 20, 2018 11:47 pm
I much appreciate your reply.
I've confused you here. I want to build a liveable area in the Attic/Loft with a staircase ( I'm confused over Brit and US usage) so I assume I cannot use trusses.
I have budgetted for materials but not engineering sign off and building certification fees. That is a quantitiy I have no experience with.
I will need engineering sign off on a (1) retaining wall (1.5 metres high) (I am doing the design this week)
also sign off on (2) the second story loft. (45 degree pitch) gable dormers x 2, + 2 x shed dormers on opposing side of roof.
So I guess I will need to try to estimate this, and work out how much money to shuffle from materials/fittings funds.
I will look at the bay dormer window, thanks for the suggestion.
ATM I was thinking of 'wall dormers' flush with external brick skin and double doors opening inward. Just opened the loft floor example you linked to, thank you, nice example I will look at the details later.
Like most 'poor' OBs, I want to do as much work as possible on the design, I chose Revit, despite it being a little too complicated for me to learn quickly, (especially designing dormers etc) Then get my design vetted/modified/signed off.
The reviews I read, gave no recommendation of a simpler more intuitive substitute application.
Re: How to minimise building certification & engineering fee4
Nov 21, 2018 12:25 am
Try a simpler 3D Bim Program like sketchup
The Engineers on this project
are worth every cent they were paid.......
Re: How to minimise building certification & engineering fee5
Dec 02, 2018 1:24 pm
re: your comment.
"On a 45 deg pitched roof you also might want to consider a bay dormer window
Can you post or link to an example bay dormer window.
Some sites indicate a "shed dormer" as a bay dormer, is that what you mean.
At present I am putting shed dormers on one side and Gable dormers on the more visible side to Laneway.
It occurred to me that you might mean a gable dormer that is set back from the wall plate, so windows or doors of the dormer are contained in a stepped in section, like a bay. This is in contrast to a wall dormer, where the window or doors of the dormer are flush with wall external wall below.
Re: How to minimise building certification & engineering fee6
Dec 02, 2018 2:18 pm
This is my favourite roof window detail
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