what to stuff in driveway gaps?

[peter]

There is a strip of rotting wood between the concrete slabs on my driveway. It is about 1" wide. Is this a standard lumber item, or would I have to cut it from something else? Is there anything better than a strip of wood?

Between the driveway and walkway, and between the walkway slabs, there are half-inch gaps but no wood strips in them. I don't know what is supposed to be in these gaps, but now they are filled with random junk/dirt and topped with moss. What is the proper way to stuff these gaps?

[Ron]

Clean out the gaps and apply caulk. The gray stuff specifically for concrete.

[louie]

stuff in a foam filler rod first, then fill the rest with the caulk recommended by Ron. The gap is likely to be too large for just caulk by itself.

[DanG]

You are looking for "backer rod". Here is an example:

need to install the appropriate size for the gap(s) you have.

Follow with the proper caulk/sealant like There are several good manufacturers but these come to mind: Vulkem NP1, if the joints are fairly level use SL1 (self leveling) DowCorning 795 silicone.

You can also fill the joints with pourable rubber sealant like:

or

(top posted for your convenience) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Keep the whole world singing . . . . DanG (remove the sevens) [e-mail]

[peter]

I just went to home depot to look. There are at least 3 similar sealants that says concrete & masonry sealant, and they are all gray color. Here they are (I had to use acehardware's web site because HD's web site sucks):

one do I choose? I want to pick the best one for the job so I won't have to do it again for a long time.

The driveway is sloped; I probably don't want self leveling. The rubber sealant looks good but I don't want jet black sealant. It would be too loud against a medium gray driveway.

One more question: can any of these sealant withstand driveway being pressure-washed?

[DanG]

Of the names that you show, I would go with the PL product only because their adhesives are pretty good.

Professional names in the type products I would recommend: Sika Sonneborn/DeGussa Vulkem Tremco Pecora Dow Corning (the only silicone I would consider)

Here is a fairly comprehensive list of manufacturers"

(top posted for your convenience) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Keep the whole world singing . . . . DanG (remove the sevens) [e-mail]