I don't completely follow, they drill a hole in the hollow block, drive in a plug meant for wood? And they don't use screws, they just nail the frames? Or do you mean they've driven wood into the hole and then nailed the frame to this wood which somehow acts as a plug?thomas33 said:
If I decide to use sprits and some type of cement (similar to what is already there), what should I choose? Suggestions on model and brand? It is important that it integrates with the surrounding environment, i.e., bonds with the hollow stone and plaster so it doesn't crack when drilling adjacent holes.
It's an extra plus if the bag is already pre-mixed, i.e., just add water without having to experiment with sand.
It's an extra plus if the bag is already pre-mixed, i.e., just add water without having to experiment with sand.
Yes, I've seen that construction before and it seems to hold well as you say. I suspect that I will need to patch more in the basement in the future, and it's good to have a consistent technique for it instead of special solutions. So I thought if I find a good solution here to fill the holes sustainably and well while maintaining breathability, I can use this later for other repairs, maybe stairs or other holes in the walls.thomas33 said:
Member
· Västra Götaland
· 145 posts
It is absolutely no problem to fill such holes with husfix or something similar. Just make sure it is cleaned properly beforehand; use compressed air if you have it, otherwise insert a straw and blow hard, but make sure to close your eyes if you do the latter so you don't get anything in your eyes!
Then take a spray bottle or similar and spray into the hole (using a stream, not a mist) until the water that comes out is completely clear; this also pre-waters adequately so the husfix doesn't dry out too much.
Then just mix husfix to the consistency of moist potting soil. Take a smaller spatula with the fix and hold it in front of the hole, then a stick or the back of a drill or something else about 8 mm and push in. Keep pushing in more fix and pressing until you feel resistance. If the fix is squeezed out around the stick, the stick is too small or the fix is too loose.
When maybe 20 mm of the hole remains, you can take the spatula and fill and smooth out the last part; also press with the spatula so it's compacted properly.
Then you'll be able to both drill and plug in the same spot, and it will probably hold even better than if you had set the plug directly into the wall...
Then take a spray bottle or similar and spray into the hole (using a stream, not a mist) until the water that comes out is completely clear; this also pre-waters adequately so the husfix doesn't dry out too much.
Then just mix husfix to the consistency of moist potting soil. Take a smaller spatula with the fix and hold it in front of the hole, then a stick or the back of a drill or something else about 8 mm and push in. Keep pushing in more fix and pressing until you feel resistance. If the fix is squeezed out around the stick, the stick is too small or the fix is too loose.
When maybe 20 mm of the hole remains, you can take the spatula and fill and smooth out the last part; also press with the spatula so it's compacted properly.
Then you'll be able to both drill and plug in the same spot, and it will probably hold even better than if you had set the plug directly into the wall...
Perfect description! Thanks, I’ll go with this. It will take some time but I have plenty of time, so it's just as well to do it thoroughly from the start.ensamresande said:
Is there anything specific to consider with husfix? particular brand? specific mixture? I saw that Byggmax had it but it had their own brand on it?
Other times when I've tried to fill concrete holes with filler (Beckers) it hasn't stuck properly and instead followed out. Most likely the surface is very porous and releases sand easily, which causes the filler not to adhere properly. But maybe it helps if I vacuum or blow the hole clean.
Last edited:
Member
· Västra Götaland
· 145 posts
About the brand: there's probably nothing wrong with Byggmax house fix. Otherwise, Casco's version is sold at places like Bauhaus (and probably Hornbach, etc. too).
About mixing: as mentioned, don't make it too loose, as it will be difficult to fill and compress properly in the holes. Think of it like damp potting soil.
If it has come out before, the hole probably wasn't completely clean so it didn't adhere. It's hard to vacuum inside a hole, but blowing with a straw or similar usually works well. Don't forget to spray plenty of water into the hole too (until what runs out is completely clear), as it's important for the fix to adhere properly and not dry out too quickly.
About mixing: as mentioned, don't make it too loose, as it will be difficult to fill and compress properly in the holes. Think of it like damp potting soil.
If it has come out before, the hole probably wasn't completely clean so it didn't adhere. It's hard to vacuum inside a hole, but blowing with a straw or similar usually works well. Don't forget to spray plenty of water into the hole too (until what runs out is completely clear), as it's important for the fix to adhere properly and not dry out too quickly.
Okay, but if I spray water inside the wall until the water runs out, there could be a lot of standing water in there, it's hål sten. Shouldn't it be enough just to moisten?ensamresande said:
Can you be sure that husfix really breathes and has the same function as concrete(hålsten)\render?
I don't understand your concern about it being too tight?
You are only supposed to fill some small areas of a few places and not cover the entire wall with something. Therefore, there are never any problems, whatever you use.
You are only supposed to fill some small areas of a few places and not cover the entire wall with something. Therefore, there are never any problems, whatever you use.
Member
· Västra Götaland
· 145 posts
Upon a second look at your pictures; it seems like your wall is made of hollow stone rather than solid lightweight concrete/expanded clay, so you can disregard what I wrote about pressing in house fix or similar. 
Fischer has a product called Fill & Fix, also known as a liquid plug, with a sleeve you insert into the hole and then a syringe with a kind of expanding epoxy. Not cheap (about 200 SEK if I remember correctly) but works very well. Available at Bauhaus (and probably also Hornbach).
Fischer has a product called Fill & Fix, also known as a liquid plug, with a sleeve you insert into the hole and then a syringe with a kind of expanding epoxy. Not cheap (about 200 SEK if I remember correctly) but works very well. Available at Bauhaus (and probably also Hornbach).
There's no problem filling 4 small holes with some non-breathable substance; the issue is when you fill a little here and a little there in a basement. I've already filled in some holes with regular putty and also leveled around 2 windows, and this was done before I found out that putty shouldn't be used in basements. So my hope now is to find a durable way to putty in the basement in the future, and even if these are small areas, there is a risk that it could eventually have a negative effect.thomas33 said:
That's correct, it is some form of hollow brick, maybe lightweight concrete as you say. However, it should not be radon because we have measured that.ensamresande said:Upon a second look at your pictures; it looks like your wall is made of hollow bricks and not solid lightweight concrete/light clinker, then you can forget what I wrote about pressing in husfix or similar.
Fischer has a product called Fill & Fix, also known as liquid plug, with a sleeve you insert into the hole and then a syringe with a kind of expanding epoxy. Not cheap (around 200 SEK I recall) but works very well. Available at Bauhaus (and probably also Hornbach).
Why couldn't I use husfix here? My initial idea was to use some form of syringe to fill inside the stone (the cavities) and work my way outward until it can be spackled on the outside. That is, something similar to what you suggested, why can't this be done?
I have been recommended Fischer Fill & Fix before and it seems to be a good product, but I would very much like to find a sustainable solution in the long term. That is, if I need to spackle more in the future, I will use the same.
If I were to replace the husfix with real concrete/mortar, would that help?
Member
· Västra Götaland
· 145 posts
The problem is not the fix but rather the cavity you need to fill. Do you have any idea how large the holes in the stones are? Is it like hollow cinder blocks (few large holes), or more like hollow bricks (many small holes)?
I get the impression that there are fewer larger holes when I drill. I can feel when I get through the plaster and the first part of the stone, then I go quite a bit in to the next wall.ensamresande said:
But if you use a nozzle to go in a bit and then push in as much fix as you can, it should fill up well. And even if it doesn’t fill all the way to the bottom, it should still be able to hold well when it dries.
Ankarmassa?
However, you will never ever be able to get the screw out again, unless you tear down the wall around it.
Maybe you can press in a tight plug, let it semi-harden, and then screw in the screw. Then you should be able to unscrew the screw if needed later. If you're lucky, it might not clamp the plug too tightly either, so you might be able to screw in and out as you wish even if you let it fully harden first...
However, you will never ever be able to get the screw out again, unless you tear down the wall around it.
Maybe you can press in a tight plug, let it semi-harden, and then screw in the screw. Then you should be able to unscrew the screw if needed later. If you're lucky, it might not clamp the plug too tightly either, so you might be able to screw in and out as you wish even if you let it fully harden first...