How thinck? If you draw lines on the foam to indicate where the roadbed goes, you should spread the caulk so thin you can see the lines easily. That's all it takes. Noo need too glop it on so it oozes out. Same for the track on toop of the cork. VERY thin. I use the kind that dries clear, but it comes out white - well, after I spread it thin, it's so thin it already looks clear, just a shiny area where it is. This has proven to be more than enough to hold the track and roadbed down, yet the track can be easily removed without damage (at least before ballast is applied). If it oozes out under the cork or between the ties, you are using far too much.
--Randy
Modeling the Reading Railroad in the 1950's
Visit my web site at www.readingeastpenn.com for construction updates, DCC Info, and more.
Cheap caulk does the trick. Axel Plus (clear) works. You need no better. If you change your mind, it's reversible but holds up until you do.
TF
BuchananBucks I lay out the route of the roadbed and mark both sides of it with a fine tip sharpie. I am using PL-300 to glue the roadbed to the foam base. I lay a bead of the PL-300 in the middle of lines, and then spread it evenly with a 1.5" putty knife. I press the roadbed in place, and go over it with a small wallpaper roller. I use the putty knife to clean up any PL-300 visible around the edges, and then insert "many" push pins (2 per inch). It will set up overnight. After removing the push pins the next evening, I lay track using PECO pins (track nails). The PL-300 holds them well! I started out using a thin layer of caulk to fasten the track, but humidity fluctuations in my very dry basement caused it to come loose. Granted, I likely soldered a few more pieces of flextrack than I should have, but using the nails and leaving a few more small gaps in the track has produced great results. Cheers!
I lay out the route of the roadbed and mark both sides of it with a fine tip sharpie. I am using PL-300 to glue the roadbed to the foam base. I lay a bead of the PL-300 in the middle of lines, and then spread it evenly with a 1.5" putty knife. I press the roadbed in place, and go over it with a small wallpaper roller. I use the putty knife to clean up any PL-300 visible around the edges, and then insert "many" push pins (2 per inch). It will set up overnight. After removing the push pins the next evening, I lay track using PECO pins (track nails). The PL-300 holds them well!
I started out using a thin layer of caulk to fasten the track, but humidity fluctuations in my very dry basement caused it to come loose. Granted, I likely soldered a few more pieces of flextrack than I should have, but using the nails and leaving a few more small gaps in the track has produced great results. Cheers!
How thick a layer of PL 300 do you put down? Some one had said that foamboard even with cork roadbed shouldn't hold track nails.
Yes sir, on my larger layout in Tennessee, 30X 45, I got the suggestion from Chuck Hitchcock on an Allen Keller video, he called it Topper Tape, he wrote an article about it in MR, same thing and it works great and a lot cheaper that cork. It also has sticky stuff on both sides, and once you put it down it doesn't move, then you can press the track down on the top side, same thing the track is fixed and it is just wide enough for track roadbed. I applied it directly to the blue foam and boy does it stick.
All you have to do is apply your ballast, no gluing if you don't want too and the height is just right giving you a good profile, again no gluing cork down and it is cost saving.
Robert Sylvester,
Newberry-Columbia, SC
Another option is what's called 'camper tape' - it's the rubber strip that is put around the rim of a pickup bed before you put a cap or camper on it. Usually has adhesive already applied to at least one side, peel and stick. I took a look at it in a store one day but didn;t get any to try. One thing is it does not have a beveled edge. There was an article in MR a number of years ago where a guy made a dispenser with a knife blade so that you could pull it off the roll with a 45 degree bevel down the middle - use it like cork, pull the two halves apart, flip one over so the 45s are on the outside, and stick it in place.
Oh yea, it's called sill seal. You put that down on top of the foundation wall before you start building the main floor deck.
I never thought about it for track bed. I'm glad it's working.
Mike.
My You Tube
I used to use cork for roadbed but I began to look at expense, so one day while walking through a big box hardware store looking for the blue foam 4X8 sheets for use on the layout I noticed these large rolls of thin insulation on the shelves. As I eyeballed this find I noticed that as I unrolled a section it was a about 1/4 inch thick and 6 or so inches wide and very pliable. I thought for a moment, almost like cork but not as thick and stiff and I could cut the rolls down to 2-3 inches wide and use it for roadbed. So, for literally a couple of bucks I bought a whole roll and marched home with my new find.
Arriving at the train room, where construction was still taking place, I rolled out several feet of this blue insulation and placed it on my blue foam base, I then put a three foot section of Flex Track on the foam and thought to myself why not.
I decided to adhere the insulation strips to the blue foam with white caulk. It's cheap and would be more than enough to hold down the foam insulation strips to the blue foam base then place the fleck track on top, again using white caulk for the track, "It worked". When adhereing both the blue foam strip and track I would spread the caulk down to a very thin layer with a metal spatula, press the foam strip onto the caulk, the same with the track and use push pins to hold things in place until the caulk cured.
It was easy and very cost effective. Just remember when using this foam becareful when soldering wires to the track.
Hopefully another helpful hint.
Robert Sylvester
Newberry-Columbia Line, SC
Latex - it's cheaper, not smelly, and cleans up easier. And sticks just as good for model railroad purposes. Unless you have a latex allergy.
rrinker And that horrible acetic acid smell of silicone caulk - no thanks. I made the mistake of getting a tube to seal up the cracks around the window in my old basement. That was a worse smell than ANYTHING I ever did in the basement model railroad related. --Randy
And that horrible acetic acid smell of silicone caulk - no thanks. I made the mistake of getting a tube to seal up the cracks around the window in my old basement. That was a worse smell than ANYTHING I ever did in the basement model railroad related.
You got that straight Randy.... Finally someone who understands.
I've hated silicone my whole life. The smell makes me sick to my stomach. I use it as little as possible. Sometimes I have to use it at work when I have no choice.
I don't know what it is with caulk where you always feel you have to get your fingers involved to schmooze it, I'm guilty. Silicone... I don't care what it looks like after I put it on. I have learned not to stick my fingers in that crap. It gets in your bloodstream through your capillaries and pretty soon you have a stomach ache and actually feel like you can taste it in your mouth.
I hate silicone. TF
MidlandMike Doesn't the caulk gum-up the roller?
Doesn't the caulk gum-up the roller?
Hey Mike.... surprisingly no, after it builds up a little bit on the roller it works even better. When you're done it washes up good with hot water.
I don't think there's any difference in the behavior of latex caulk compared to silicone. And that horrible acetic acid smell of silicone caulk - no thanks. I made the mistake of getting a tube to seal up the cracks around the window in my old basement. That was a worse smell than ANYTHING I ever did in the basement model railroad related. For caulking the OUTSIDE of my house - no problem. I would always use silicone caulk, it lasts longer than latex when used for exterior things. But latex rubs right off the materials like the cork or the track, and it doesn't need 24 hours to set up.
Hello all,
I use G.E. Silicone I or II Clear caulk.
The difference between the two is set time. The Silicone II is "Rain-Ready" in 30-minutes.
Silicone I recommends a 12-hour set time before exposing to moisture.
I allow both to cure for 24-hours before laying track on the roadbed.
My base is blue foam and I use Woodland Scenics foam roadbed.
The advantage of using silicone caulk is that if you need to reposition the roadbed the silicone does not eat into the base or roadbed. The roadbed can be peeled up and the residual caulk on the foam or roadbed can be rubbed off with your fingers.
MidlandMikeWhat do you use to spread the caulk so thin? Putty knife?
I bought a plastic putty knife set and the 1-1/2-inch wide one is the perfect width for roadbed.
For straight sections I put a bead of caulk down the center line and spread it as thin as possible before positioning.
To hold the road bed in place while it cures I use "T" pins.
For curves I place the "T" pins along the center line of the radius approximately 3-inches apart as a guide.
For the split roadbed, I put a thinner bead down and place the outeside radius first.
Then I secure the outside radius with more "T" pins.
For the inside radius I use the "T" pins to hold the roadbed in place against the outside radius.
I don't cut the ends of the curves flush; allowing them to dove-tail into the next curved section. I only cut the ends flush when they meet a straight section.
Cleanup is done with warm water and a lint free rag.
Hope this helps.
"Uhh...I didn’t know it was 'impossible' I just made it work...sorry"
MidlandMikeDoesn't the caulk gum-up the roller?
You can wash it off before it drys or peel it off after.
Henry
COB Potomac & Northern
Shenandoah Valley
I'm agreeable with everybody using caulk to put cork down to foam. I'm sure a card works great as an applicator.
When I put my cork down I put a dotted line down the center of it with the caulk gun and used a wallpaper seam roller back and forth and it applied it really evenly. I had a center line on my foam and put my cork down with T pins.
I used Dap Alex Plus. It's the cheapest caulk at the big box stores but it's all you need. It's foam safe and if you want to take your cork back up and move it, you can.
I use polyseamseal to glue foam to foam. It outperforms the blue foam adhesive. The stuff's like super elastic bubble plastic it never comes apart.
Everybody has their own chosen methods that work for them. It's all about sharing ideas. I've switched to other things people have used here
I don't even use weights with caulk just a few push pins, mostly at the ends and joints to keep the edges from lifting. Within a half hour or so, it's dry enough to take out the pushpins and lay the track on top.
I use a putty knife, but those fake credit cards work too. The ones I've been getting lately are barely laminated paper though and have absolute NO stiffness. I don't think those would work as well.
There's a trick when using full size tubes of caulk - the nozzles are usually marked with rings to use some cutters to open up, but even the smallest of those is far too large for our purposes here. Might be great for caulking windows or your bathtub, but we want to dispense SMALL amounts. So what I do it use my rail nippers (the nozzle is plastic, MUCH softer than nickle silver rail, so it won't hurt the nippers) to snip off bits of the end until I just get an opening. Now comes problem #2 - the tubes are sealed with a foil cover over the end, way down at the tube end of the nozzle. WIth the 'normal' size holes, the most common thing to do is poke a nail through it. Can;t do that with the tiny opening - so I use a piece of my #20 solid feeder wire - that's the size of hole I have in the end. When you do this, what comes out is a VERY narrow bead of caulk, a thin line. Spread that down with a putty knife or tool of your choice, and that's PLENTY of caulk to secure the roadbed or track - I tend to spread it less to secure the cork to foam, since it doesn't show, but for track, spread it out to almost invisible. Small gaps here and there won't hurt anything either. In no case, cork to foam or track to cork, should there EVER be caulk oozing out anywhere. On the track, it should not come up on the sides of the ties. It takes very little to hold the track, and I ran trains for months before ballasting, which further secures the track. Years in some places - I never did get the whole thing ballasted before moving. ANd even after having it carried down 2 flights of stairs and loaded in a moving truck, the ncarried in my new basement - none of the track EVER came off. Yet if I gently lifted the track and slid a putty knife under it, I could pull up whatever I wanted with no damage.
All of this is why I am sold on caulking track instead of nailing it. Especially with many modern brands of flex track not having nail holes by default. TO sit there and drill nail holes on top of everything - more power to you, I'll have 3 or 4 more sections of track laid while you're still sitting there with the pin vise drilling nail holes. Using caulk is not limited to building on foam - it will secure the cork or even the various homasote roadbeds to plywood just as well.
kasskabooseFor attaching cork, I use cheap Elmer's glue.
Elmers white glue can "bleed" through the top and glue any weight you have holding the cork. Wax paper solves that problem
Count me as another foam proponent for all the reasons mentioned.
For attaching cork, I use cheap Elmer's glue. It's also easy to remove. Lifting cork is something that occurs often for me.
MidlandMike What do you use to spread the caulk so thin? Putty knife?
What do you use to spread the caulk so thin? Putty knife?
I use thouse sample credit cards, but just about anything would work. Stiff cardboard,scrap plastic,piece of wood ect. I prefer something I can just toss when done
When I first started experimenting with extruded foam, I took to hear twhat all the articles said - use something like the PL-300 construction adhesive. They don;t carry that in the big box stores around here, but they do have Liquid Nails for Foamboard. I tried it - HATED the stuff. It adhered poorly to the foam, dried rock hard and cracked. That's when I switched to latex caulk and never had a problem again. Latex caulk worked for everything - I even stuck a Tortoise to the bottom of the foam with latex caulk, no screws, no square of wood - and it wasn't coming off for nothing. I was eventually able to break it off, but applying so much pressure that it would ne next to impossible for it to accidently get that much force applied - and the caulk didn;t break loose even then - the whole thing came off with a small chunk of foam still glued to the top of the Tortoise.
Track has been very easy to remove from cork when glued down with latex caulk. Because the trick is to use a VERY TINY amount - just a bare coating is all it takes, spread out so thin it's almost not there. Even springy Atlas flex sticks in place, yet gently sliding a putty knife under the track removes it without damaging the track or the cork. ANd soaking with diluted glue and alcohol when ballasting does not make it let go, even though it's latex caulk with no silicone.
I've used a variety of materials for scenery. I use a thin layer of acrylic latex caulk to hold down my cork roadbed and track. If you have to remove the track and roadbed, you can slide a putty knife under the track and roadbed, but doing so usually removes some foam. It's just a matter of using some joint compound to fill in and sand the hole to a flat surface again.
Marlon
See pictures of the Clinton-Golden Valley RR
Nice rock effects, Brent.
I'm going to have a go at creating Niagara Escarpment rock faces - limestone, shale, and various colours of clay. A nearby club has a nice how-to, which looks pretty simple to do, and with decent looking results, too.
Wayne
Wayne, I use PL300 on the foam and nothing is coming apart if glued with it.
Using caulk for cork roadbed means it can be coaxed off with little or no damage with a paint scraper. When stacking foam for mountains I have found the mountains will wiggle somewhat if bumped if I have used caulk to glue the stacks together, this helps to minimize any damage that may occur with a bump.
When I was using PL300 to glue my foam to the grid work the instructions said to press into place and pull off to let it breath for a few minutes. I am glad I got it in the right spot the first time as it was not comin off to breath for no man.
A wiggly foam rock cut.
Brent
"All of the world's problems are the result of the difference between how we think and how the world works."
It's always amazed me that so many folks seem to use extruded foam sheets for layout building, but also use such a variety of glues and caulks not necessarily meant for such use. That some of them work is, I guess, a good thing, but if you're using foam, why not use an adhesive made expressly for use with foam? LePage, and likely others, too, make such an adhesive. The LePage's version is PL300 for Foam Board. While my layout is mostly open grid with plaster-on-screen landforms, the partial upper level is open grid covered in 5/8" plywood, and in areas where I want more elevation for the track or simply some lightweight scenic contours, some extruded foam sheet, stuck to the plywood, or as layers of foam, using this product, works great. It's applied with a caulking gun, doesn't melt the foam, and sticks to anything like...well, never mind that expression.
The elevated track for the coal and sand dump-shed sits atop a foam embankment...
...and I plan to use more foam to create some rock cuts, too.
Good point Jim, didn't think of that, and I didn't use the spray bottle method to set my ballast, I used the eye dropper method, so it got "wetter". That could cause a problem with white or tacky glue.
I always figured white or a tacky glue to be a temporary, or removavle fix anyway.
White glue or Tacky is water based. Spray water over it and the roadbed will start to loosen up. Clear RTV is much cheaper and does not get affected by water when you are doing scenery work!
Modeling BNSF and Milwaukee Road in SW Wisconsin
I used caulk for the most part and that was fine. In one area I had painted the foam with cheap latex paint from Walmart and months (if not years) later I pinned down some cork on top of the latex paint and a couple of weeks later I went to peel it up to caulk it down and it was on there solid, as was the track I had just laid down on the painted foam without cork for a yard. I did peel up a bit of track and the paint stuck to the track, not the foam.
I have no problems using foam, I am in the "use what's good for the situation" camp. I have used several different methods on my current layout. Foam, wood, steel, iron, Spline and cement board. Once the ground cover is on it all looks the same.