cement gap filler

I have a 250 s.f. kitchen where I am installing 5" wide luxury vinyl planks. I have 18-24 inches around the perimeter that is from 1/4" to 3/4" lower than the rest of the floor. My plan is to use self-leveling compound. I have removed the old vinyl tiles to expose the luan plywood...

Hi all, I need to fill some 30 year old gaps which are between some cement/concrete surfaces. Attached to this post is a picture. Water gets in to the gaps and makes it's way in to the crawlspace which increases moisture in the crawlspace. Is there a certain type of filler to use? Would be...