what can i use to seal the bottom log that sits on top of a concrete block

1. This is for a large new 'boatdeck' for the Sea Cadet unit. It was built on a large concrete slab, just any they used to seal the horizontal ground sections hasn't worked - water travelling down the outside walls and pooling on the concrete seeps through in a few places.

   The outside is sheathed in box-section panels which come downward to a flared lower section which runs to a higher place the concrete slab. The gap between this flared section and the ground varies from around a few mm to a goodly 15mm or so, so it's tricky to get in to the actual department which sits on the ground to seal it.

   Some other cove has tried expanding foam along the join, but this has had limited success. I've been tasked with coming upwardly with a solution...

   My thoughts are to scrape out as much foam as possible, and then castor tanking slurry in there, finally edifice up a stiff mixture to class a flush fillet bonded to the physical.

   Thoughts please? Any other suggestions?

   Any is sued would have to bond and seal well against the concrete, and this should exist plenty to stop h2o getting any further.

   Thanks.

2. Your idea of using tanking slurry is a proficient one, but don't endeavor 'building it up' to seal it. Rather use the corner/border matting cloth that usually comes in the kits to straddle the gap, then apply a few coats of the slurry to that. This will not but employ far far less than you'd need with the build-upwardly, simply it would also allow much more flex as the metal expands and contracts with temperature changes ... far more than the physical base on which it sits.

4. Adept bespeak, Roger.

   Thanks KIAB, that looks like a good product.

   The 'expanding foam' guy used this because the access gap in this outer flared strip (this is not the actual frame member that'due south sealed against the concrete, but rather an outer drip-strip) was very small-scale in places, just a few mm. On i side where the gap was larger - around 15mm-30mm - he ran a full mortar fillet and that seems to have worked. I guess information technology worked by bonding to the physical slab and providing a raised barrier.

   I'll endeavour a trial of removing as much of the foam as possible and see how make clean I tin can get information technology - that might determine the next step.

   Cheers gents.

5. Is that better than StixAll I wonder? Whatever I use MUST adhere and seal fully against the concrete slab - hence me existence drawn to cementous tanking slurry.

6. I would think so, equally it's flexible for expansion move.

   Contact Everbuild,& see what they say,they might suggest something better.

   They have a very wide range of sealants,including Sika,similar HYBRIFLEX 40 which is resistant to salt water,they are better quailty than me to recommended a suitable product.

   Last edited: Sep 25, 2018

7. I would exercise two things

   ane. seal the physical that is visible on the outside. This will stop the physical absorbing water and tracking to the inside - especially where information technology is pooling

   2. Make some fibreglass flashing that volition run along the metal and menstruation on to the sealed concrete. I would lay a piece of plastic conduit/ trunking in the 90 degree between the metal and the concrete to give a shallower return and also allow some movement in heat and cold.

8. Demand photograph'southward.

9. Thank you - I'll come back with photos in one case I've had a chance to get downward at that place for a proper scrape and gander.

10. I've used this to seal big gaps under window frames, fill chunks to underside of cill. It doesn't slump or compress. Sticks to clammy surfaces (polyurethane glues won't Stixall volition though). Information technology'southward water proof and could exist used for nigh part of the sealing with a line or 2 of stixall at terminate if needs exist.

11. Seal information technology and build it upwards - on the inside.

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Source: https://community.screwfix.com/threads/best-way-to-waterproof-seal-metal-shed-to-concrete-base.204350/

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