9 replies to this topic

[Stefan Liede]

i run into difficulties with opening sizes in house plans

normally i have drawn all my construction plans with

the standard window and door sizes that caused never ever

a problem because the framer on jobsite added all rough opening sizes,

if necessary, mostly 2" or 2.5" wider

 

i have now moved to another province and all opening sizes in

the plans went wrong  -to small- !

is there any regulation to draw additional the rough opening sizes

on plans ?

thank you for any advice

-stefan

Canda

 

[Keith Almond]

No. Typically the framer should add space for the RSO. It's generally accepted that the opening shown is the size of the window, NOT the RSO.

It may be wise however to note that the size shown is the window, and that RSO's should be taken from manufacturer's specifications.

[Martin Livingston]

We are a production builder and generally use the same window/door supplier most of the time so I created a library of their entire window catalogue. We do not use their recommended RSO because we have our own way of doing things. So when I add a window the RSO is automatically added to the floor plan drawings. Our rational is that the framers do not care what the window size is and are only concerned about the opening they need to frame. I also include the product code as it would appear on the packing slips and the labels on the windows so that the correct window goes into the opening.

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[Martin Livingston]

If you are drawing plans for multiple builders and they require the RSO's added to the plan you will need to find out their preferred clearances. The RSO's are editable while keeping the product code.

[Keith Almond]

Again, TYPICALLY as Martin shows on his drawing. If the opening shown is the RSO, it's normally noted as RSO (or RO). Otherwise I would expect the size to be window size. That's how it's always been with the builders I've worked for in Ontario.

 

We generally work for either private clients or multiple builders, so we have NO idea what window manufacturer will be used. and therefore we always spec. "Refer to manufacturer for recommended rough stud openings".

[Kevin Rabenaldt]

It could be a local way of interpretation but the call size should be the window size unless both sizes are given or a note that says these are RO size..  The rough opening should be provided by the builder.  Specs do change after a drawing is made, even the size of the window. Or the window manufacturer may not have been choose yet.   I guess another note is in order to clarify to be on the safe side these days.

 

Or maybe it was a framer who was inexperienced or made a mistake by lack of communication.

[Keith Almond]

... is there any regulation to draw additional the rough opening sizes on plans ? ...

 

As far as I'm aware there is NO regulation ANYWHERE that determines how you draw.

 

How much information you provide for a building permit is between you and the Building Inspector. How much information you provide to "cover your ass" is entirely up to you!

[D M]

We typically provide only the nominal size of each window, ..  say 48x36

 

We don't supply windows and are not about to recommend a specific product. (If there's a failing in a product, we prefer not to be caught up in any legal quarrels)

 

.. as we have no idea which window supplier a client may decide to go with, and each supplier can have a different RO for the same nominal size (although arguably there's usually a minimal difference)

 

we leave it up to the client to provide that information to their framer, .. and make NOTE of that on the drawings

 

it also saves us time in making RO changes should the client waffle back and forth on their choice, ..

[Stefan Liede]

thanks so much everybody

that are clear answers

[Michael Roman]

Good Topic.  My customers tend to have a window supplier picked out by the time we are doing drawings.  Most of my customers have a builder already and that builder has a particular manufacturer that he likes to use.

One thing to watch out for  when using nominal size windows is that some sizes that meet egress with one manufacturer will not meet with another manufacturer.

I always to include the manufacturer, their product code and the rough opening for each window.  That seems to take care of the problems.