Hi. I'm building a large rendered planter from concrete blocks and I've read that its advisable to paint the interior with tanking paint. My question is, as the soil will not be to the brim I will need to render the top 10cm or of of the interior. If I paint that section with the waterproof paint will the render adhere to the blockers or should I leave that section free of paint? Thanks in advance
Hi renfrew999 Concrete blocks are porous, if the inside is going to be painted it is impossible to fill all the fissures and stop damp from the soil entering the blocks. With the outside rendered some areas of the rendering will eventually blow by frost action. It will therefore make little difference if you paint to the top but probably better to leave the top few cm unpainted. Regards S
DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!