DIY Aircrete Faux Stone Facade, Part 2 — Building The Silicone Molds For Pouring Fake Concrete “Stones”

Simply to recap, yesterday I confirmed you ways I used the precise stone on the entrance of my home…

…to create a silicone stone textured mildew…

…that appeared like this as soon as it was dry and pulled off of the stone.

For the needs of this put up, I’ll you the mildew I created utilizing the textured mat that I made utilizing this particular stone on the entrance of our home. You may see simply how textured this stone is.

I measured the textured a part of the mat and decided that I would wish the completed inside measurements of the mildew to be 5″ x 16″. So I lower a chunk of scrap plywood to that actual measurement on my desk noticed. Then I lower sides out of PVC boards. I used PVC as a result of I already had these available, so I didn’t want to purchase any additional provides. However it’s also possible to use melamine-coated plywood for these areas. I used 1″ x 4″ boards and lower the top items to five inches huge, after which I lower two items for the lengthy sides to 17.5 inches.

I screwed all of these items collectively to create a quite simple field. I didn’t use any adhesive to construct the field as a result of I’ll want to have the ability to take this field aside very simply to take away the concrete “stone” after it’s dry, after which I’ll want to have the ability to put the field again collectively very simply to pour the subsequent one.

As soon as my field was put collectively, I trimmed my silicone textured mat to suit contained in the field. This silicone cuts very simply with scissors, however I additionally used a utility knife with a brand new blade on it to do a number of the cuts. Each labored very well, and the silicone was very simple to trim.

I lower slightly bit at a time to verify it was sort of a cosy match. You may at all times lower off extra, however in case you lower off an excessive amount of, there’s actually nothing you are able to do about that.

As soon as I obtained it lower to suit, I needed to do some changes. You may see how wavy the silicone mat is on the perimeters.

Easy methods to construct a mildew with a DIY textured silicone mat for pouring faux concrete (aircrete) stones

And naturally, this man made my challenge a bit slower and more difficult. He doesn’t actually perceive that I’m exterior to work on initiatives. He at all times thinks I’m exterior to pet him and let him sleep on my lap. 😀

Anyway, again to the challenge…

The rationale it’s wavy like it’s because the backs of my silicone mats aren’t flat. I really tried to make them flat. On the primary one I made, I attempted placing the silicone/cornstarch ball on a chunk of plywood after which urgent it to the stone, however that didn’t work out in any respect. Not solely would which have required about twice the quantity of silicone per stone (and silicone caulk isn’t low cost!), however I wasn’t capable of apply sufficient even strain to get the silicone pressed into all the texture and crevices on the stone. That course of may go on stones that aren’t so closely textured and don’t have a lot excessive reduction on them, however for these stones, it was a no-go. So I ended up abandoning the plywood/flat again plan, and I simply used my fingers to press the silicone to the stone. That resulted on this very irregular and undoubtedly not flat bottom on every silicone mat.

So I had so as to add a step to make up for that irregular bottom on the silicone mats. First, I used a tremendous Sharpie marker and marked the best level. After which I eliminated the silicone mat and marked a steady line at that peak all the best way across the inside the field.

After which I used paver sand to elevate the low areas. I simply used a butter knife to slip between the field and the mat in order that I may elevate the mat within the low areas, drop some sand below the mat in that space, after which push the mat again down onto the sand. It was a messy course of, however I continued this all the best way round till the perimeters of the mat lined up with the black Sharpie line all the best way across the mildew.

Right here’s a take a look at it leveled with the road all the best way across the field from one other perspective.

As soon as I had the mat lined up all the best way round, I noticed that I ought to have taken the chance once I had the mat out of the field to attract a second line 3/4″ above the primary line to point how far up I’d pour the concrete. I forgot to try this, and there was no approach I used to be going to take away the mat after getting it excellent, so I did my greatest. However this could have been a lot simpler to do earlier than I added the mat and the sand.

After eradicating the additional sand with my shopvac, the ultimate step to prep my mildew for pouring the concrete was so as to add a bead of caulk within the corners of the field in addition to the place the mat meets the field. I used silicone caulk for this, however I feel this was a mistake. These things dries so slowly!! So I feel from right here on out, I’ll be utilizing a fast dry siliconized latex caulk for this step. I can’t wait a number of hours for caulk to dry between pourings.

In order that’s so far as I obtained yesterday. I’ve a pair extra molds to construct at this time, after which I’ll be on to pouring the precise concrete (aircrete) “stones”. I’m hoping I can get some poured earlier than the top of the day at this time.

I used to be going to pour some yesterday with the molds I’ve ready, however I feel I’m going to make a change within the aircrete combination that I used to be planning to make use of. I’ll share extra in regards to the course of once I get some made, however the method I’m utilizing for the aircrete specifies utilizing Portland cement, in order that’s what I purchased. The issue with Portland cement is that it takes 24 hours to dry. I can’t pour six stones a day. I’ll by no means get this challenge executed at that fee. I would like a quick-drying concrete. So I’m going to check the aircrete method utilizing Speedy Set Cement All, which units in quarter-hour and might be demolded in an hour.

I don’t know if it should work as a result of I don’t know if the components that make that product a fast set cement will work with the aircrete method. My mind isn’t wired for chemistry, so these components would possibly have an effect on the aircrete course of. I don’t know, however I’m going to try it out and see if it should work. I certain hope it does as a result of I would like these stones to dry in a short time!