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

Simply to recap, yesterday I confirmed you the way 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 submit, 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’ll be able to see simply how textured this stone is.

I measured the textured a part of the mat and decided that I would want the completed inside measurements of the mildew to be 5″ x 16″. So I minimize a chunk of scrap plywood to that actual measurement on my desk noticed. Then I minimize sides out of PVC boards. I used PVC as a result of I already had these readily available, so I didn’t want to purchase any additional provides. However you too can use melamine-coated plywood for these areas. I used 1″ x 4″ boards and minimize the top items to five inches broad, after which I minimize 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 among the cuts. Each labored rather well, and the silicone was very simple to trim.

I minimize somewhat bit at a time to ensure it was form of a cosy match. You’ll be able to at all times minimize off extra, however in case you minimize off an excessive amount of, there’s actually nothing you are able to do about that.

As soon as I acquired it minimize to suit, I needed to do some changes. You’ll be able to see how wavy the silicone mat is on the sides.

The way to construct a mildew with a DIY textured silicone mat for pouring pretend concrete (aircrete) stones

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

Anyway, again to the venture…

The explanation it’s wavy like it is 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 in a position to apply sufficient even strain to get the silicone pressed into all the texture and crevices on the stone. That course of may match on stones that aren’t so closely textured and don’t have a lot excessive aid 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 arms 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 nice Sharpie marker and marked the best level. After which I eliminated the silicone mat and marked a steady line at that top all the way in which across the within the field.

After which I used paver sand to carry the low areas. I simply used a butter knife to slip between the field and the mat in order that I might carry the mat within the low areas, drop some sand beneath 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 way in which round till the sides of the mat lined up with the black Sharpie line all the way in which across the mildew.

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

As soon as I had the mat lined up all the way in which round, I noticed that I ought to have taken the chance after 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 do this, and there was no means I used to be going to take away the mat after getting it good, so I did my greatest. However this might 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 items 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 acquired yesterday. I’ve a pair extra molds to construct right this moment, 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 right this moment.

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 after I get some made, however the components 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 venture carried out at that price. I want a quick-drying concrete. So I’m going to check the aircrete components utilizing Speedy Set Cement All, which units in quarter-hour and might be demolded in an hour.

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