Best way to install 2-layers of Drywall on RSIC ceiling and walls

[Rod Gervais]

What is the dimension of your space perpendicular to the hat sections?

You will always get maximum isolation with staggered joints.

Rod

[LegGodt]

15 feet 8 inches

Thanks!

[Rod Gervais]

OK - so you are 2 sheets wide - great dimension for drywall - it's meaningless how far from the wall your starters are as long as your prime is located dead center.... which should be controlling your layout.

That would be cuts on 2 sheets to fit to wall (clearance of course for seal) - and then a full sheet centered on that to lap the joint - which would leave you slightly less than 4' cuts to finish..... virtually no waste this way....

Rod

[LegGodt]

That makes sense. I was thinking start counting from the wall to allow a full sheet, but I definitely see the advantage of starting in the center and measuring from there.

In the end it's just a few more cuts ...

Thanks!

[LegGodt]

When using RSIC, should the first layer of drywall on the ceiling be sealed with backer rod and caulk to the wall framing members?

Or should it not be connected to the framing members and instead sealed to the first layer of drywall attached with RSIC to the walls?

I've seen it explained both ways on several a sites and got confused.

Rod, I apologize if this is explained properly in your book. I have your book, but i have not been able to find a clear answer on this topic in the book. It could be my 15 month old and lack of sleep ... Just sayin'

Thanks!!!

[Rod Gervais]

When using channel refer to figure 10.12 - it's the same whether it's RC1 or a RISC system....

Rod

[LegGodt]

OMG ... Thanks so much. I will look at that tonight.

[LegGodt]

So my building supplier is no longer stocking 25 gauge drywall furring channel so he sent me 20 gauge instead. It's really hard to bend to get into the RSIC ... And in not even sure if I should be using it. The site I got the RSIC from suggests 25 gauge furring channel NOT 20 gauge.

Anyone here ever use 20 gauge furring channel or should I return it and get 25 gauge from somewhere else?

Thanks!!!

[Rod Gervais]

The added cost (and weight) gains you nothing if you don't need it for structural reasons..... however by the same token - you really lose nothing with the heavier gauge from an isolation point of view.

It all boils down to a cost issue - if the difference in cost is so little that it is (virtually) meaningless - then I would not worry about it - that doesn't deal with the difficulty of installation however - which is always challenging with stiffer materials.

I see no reason why you could not simply order the lighter material online and spend the extra cash you are spending on heavier gauge materials to rush the delivery along.

Rod