Best Adhesive for Gluing Homasote to Plywood

You might research Weldwood Contact Cement. Pretty smelly, and you better get the piece EXACTLY where you want it, because there is absolutely no moving it once it is in place. Follow the directions carefully.

@Hot Water posted:

You might research Weldwood Contact Cement. Pretty smelly, and you better get the piece EXACTLY where you want it, because there is absolutely no moving it once it is in place. Follow the directions carefully.

Thank you; I'll look at the info on that product.

Why not just use screws? There is no sound transmission with this method.

@NJCJOE posted:

Why not just use screws? There is no sound transmission with this method.

Wouldn't that cause the "rolling thunder" noise problem?  Or does that noise problem only arise when the screws go through the track and Homasote into the underlying plywood?

Only with the track screwed through the Homasote and then into the plywood.

For a good adhesive,  I  used latex caulk.  Ridiculously cheap, easily positioned and after it dries, it's Rock solid .

I suggest that you try yellow carpenter's glue.

MELGAR

I also used yellow carpenter's glue on my layout.

I just screwed mine down, I saw no reason to glue it as well.  I used plenty of screws, and it's flat and remains so.

@gunrunnerjohn posted:

I just screwed mine down, I saw no reason to glue it as well.  I used plenty of screws, and it's flat and remains so.

Right. My HO layout was done that way (1958) using 3/4" long flat-head wood screws in a counter-sunk hole in the Homasote. Worked out fine, with no noise transfer.

Yes, yellow carpenter's glue - Titebond. Screws in until glue is fully set and then back out.

Thank you for all of your answers!

@mwb posted:

Yes, yellow carpenter's glue - Titebond. Screws in until glue is fully set and then back out.

Screws through the Homasote to the plywood don't transmit any additional sound over any other method of securing the Homasote.

@gunrunnerjohn posted:

I just screwed mine down, I saw no reason to glue it as well.  I used plenty of screws, and it's flat and remains so.

That’s what I did. I figured if I ever had to take it up the last thing I want is something that is going to come up in a million little pieces. In my opinion as long as your track screws do not go through the homasote into the plywood there is no need to glue it but to each his own.

I made sure the track screws did not get to the plywood, and the combination of the Homasote and foam roadbed makes for very low noise running on the main level.  Not quite as good on the elevated sections that don't have Homasote.

@Pat Shediack posted:

I'm starting planning for our new 7 X 21 foot layout in our "forever home" and have a rather basic "layout design" question.

I plan to use 3/4" plywood topped with 1/2" Homasote.  On my last layout, built in the winter of 2006-2007, I used one of the products in the Liquid Nails line to glue the Homasote to the plywood.  I don't remember exactly which one of their products other than it came in a tube and was applied with a caulking gun.  Over the 12 to 13 years of that layout, I became less and less impressed with the Liquid Nails product as some separation and slight lifting occurred near the corners and edges of the Homasote while the 3/4" plywood attached to the Mianne benchwork with screws stayed perfectly flat.

Based on your experience with Homasote and plywood, what do you recommend as the best adhesive to glue those two materials together for the top of the layout?

Thank you.

I used screws.  I also added a barrier layer between the homosote and the plywood. The barrier is a thin rubber-like sheet used to deaden sound under hardwood flooring.  It made a difference.  

I used carpet adhesive.  Henry's makes a number of these.  I troweled it on with a notched trowel.  Used drywall screws to hold the homasote in place to the plywood until the adhesive dried and then removed the screws to use on something else in the future.  You can get Henry's at most big box home improvement stores and a square notched trowel is pretty cheap.

Not knowing any better I naively spread a bunch of PVC glue, and then kept it weighted down until it had dried.  It held right up until I had to tear the layout down.  I suspect for permanent home layout purposes any glue that will initially form a secure bond between the homasote and plywood would suffice.