Step 2. Assemble the Mantelpiece
Once the MDF boards have been cut to size, you’re ready to assemble the mantelpiece.
TIP: I have used glue, corner anchors and screws for every installation: the glue alone is not enough, but it does help to install the MDF boards correctly and as close to each other as possible.
I didn't use screws on the edges of the MDF boards, because the boards could split there and weaken the structure. And with the glue and the metal corner anchors this is really not necessary!
Start by assembling the 2 pillars of the mantelpiece: each pillar consists of a 100 x 25 panel (centre) and two 100 x 20 panels. In each corner I have placed 3 corner anchors; six per pillar.
Then we can connect the pillars with a panel of 60 x 25: flatten the pillars, with the 25 cm wide surface on the floor. Place the 60 x 25 panel between the two pillars and fix it with 2 corner anchors on each side.
This is important to be as flat as possible, on a level surface, so that the seams between the panels are as flat as possible and invisible.
Now you can lift the mantelpiece, turn it over (the top down, the bottom up), and place it on the 113 x 23 panel that will serve as the top shelf.
In the dimensions I have given you, I have left a margin of a few centimetres on 3 sides (the 2 sides and the front) to be able to place the moulding. So make sure you correctly center the chimney on the top, and only align the back side (the other 3 sides protrude a few millimeters).
Secure everything with the remaining corner anchors (2 in each pillar and 3 in the middle).
The structure is now completed!