How to Install Bullnose Corner Blocks

Bullnose corner blocks are a common architectural advice for blunting the corners of buildings and other features. A bullnose block is typically rounded or concave at the front, so they can be placed into position ready-formed. Fitting a bullnose corner block can be easy or difficult, depending upon the fabric you are using in the installation. A softer metal needs gentler tactics, otherwise you can damage it, but a stone or brick design can take a slightly harder handling.

The device of the bullnose corner block can add a touch of sophistication to a wall, or it may serve a practical purpose in preventing people from striking their heads on sharp corners. If you have some basic home improvement knowledge, you can fit your own corner bullnose without any difficulty, just by following a few simple guidelines.

Step 1 - Preparing the Corner

Before you start installing your bullnose corner block, you should sweep the area thoroughly and remove any dirt and debris. Begin by brushing out the corner using a stiff-bristled brush. This should remove any large areas of stone or caulking which have been left behind by installing the other parts of the masonry. You should then take some soapy water and wipe down the entire surface of the corner. This helps to give a smooth top to your placement, so that you can get a perfect bond.

Step 2 - Add Caulking

You will now need to spread a layer of caulking along the top of your corner, so that the block can fit on to the top of this. Smooth this over the surface of the corner until you have an even layer. If the corner will be at the outside, you will need to use 100% silicone-based caulking to keep your masonry waterproof, but if this is an internal build then you should be able to manage by using an ordinary caulk.

Step 3 -Fit the Bullnose

Take your bullnose and put some more caulk on the surface which will be placed on the existing corner. Lift the bullnose and insert into the corner, so that you have a sandwich of masonry, caulking, caulking and masonry. Move your bullnose until it fits into the best position, wriggling it without moving it around too much. Take care not to squeeze all of the liquid out between the masonry, but press down firmly enough to ensure that the caulking is bonding together.

Step 4 - Finishing

When the bullnose is firmly in position, take your putty knife and layer the caulk that has been pressed between the two masonry blocks. Wipe it so that it lies evenly against the side of the walls, but don't move caulk that is below this level. When you are satisfied that the caulk is filling up the gap, allow the installation to dry. You may need to leave the bullnose for about 48 hours before it is completely set.