Before You Begin
This pergola has a final size of approximately 11’ x 11’, so an extra pair of hands might come in handy while you are building it.Prior to installation, check that the ground where you want to build the pergola is level and identify the highest post base—this is the one you will start with.The type of anchoring hardware you use will also depend on the installation surface (ground, slabs, or composite or wood deck).
Install the Posts
2.1Use a 4' level and a board to identify any height differences between the post bases F. If they are not all the same height, calculate the difference and cut the 8' 4x4 (the highest post) as needed.
2.2Place an 8' 4x4 B into each post base F. Attach it using 8 screws (instead of 16) so that adjustments can be made later. Check that the post B is straight using a level before securing it.
2.3Cut 4" off an 8' 4x4 to make the corner post A to allow adjustment of the corner support for a level installation.
Check that the posts B are level before securing them.
Secure the Top Crossbeams
3.1Before installing the TOJA GRID corner hardware G, check the level between the corner A and one of the end posts B using a 2x4. Adjustments will be easier thanks to the 4” removed earlier. When correctly aligned, secure the hardware in place.
3.2Measure and cut two 4x4s C to a length that allows the top crossbeams to fit into the corner hardware G and rest on the end posts B.
3.3Install the 4x4s C and confirm that they are level.
3.4Using 6” treated wood screws, secure the crossbeams C to the corner hardware G and to the top of the end posts B.
Secure the Transverse Crossbeam
Support the 2x4 H with clamps for better stability while you work.
Build the Roof
5.1Determine the preferred spacing for the roof 2x4s I.
5.2Measure the distance between the corner post A and the two lateral posts B, then divide that distance by the desired spacing. Note than an even spacing has a more pleasing look.
5.3Draw a mark for each roof 2x4 I along the top crossbeams C. Note that the 2x4s I must be centred on the marks.
5.4Repeat step 4 using 16', 12', and 10' 2x4s I. Starting with the longest, place each board on the top crossbeams C in order to trace the cut angles at each end. Cut the pieces along the lines, then install them using 6” crews.
The amount of sunlight coming through your pergola will depend on the spacing of the roof 2x4s I. A greater spacing will allow more light through.
Secure the Bottom Crossbeams
6.1Draw a mark 16’’ off the ground on the longest post B.
6.2Measure the distance between the mark and the roof, then use that measurement to draw a mark on the other two posts A B to ensure that everything is straight.
6.3Measure the distance between the inside of the corner post A and the inside of two end posts B, then cut two 12’ 4x4s for the two bottom crossbeams D using those measurements.
6.4Use clamps to help hold the crossbeams D at their desired location. If needed, use a rubber mallet to adjust their positions.
6.5Check that everything is straight by placing a level on the crossbeams D.
6.6Secure each crossbeam D using two 6" treated wood screws.
Don’t have a rubber mallet? Use a wood off-cut and gently tap it with a regular hammer to adjust the crossbeams.
Build the Privacy Screens
7.1Measure and cut the central 8' 2x4 planks E that will be used to support the horizontal slats J.
7.2Starting at the top, secure both planks E using 6" treated wood screws.
7.3Measure the width of the wall sections and cut the 8' 1x4 slats J to size.
7.4Install the slats J horizontally onto the privacy screen with 1.5" treated wood screws, using the central 2x4 E to hide the joint. Use a 1” thick (or another thickness if preferred) as a template to keep the spacing between the slats J as even as possible.
Consider how much privacy you want to decide on the spacing between the boards J. Even spacing will give the screens a clean and unified look, but another option is to gradually increase the spacing from mid-height to let in a little more light while maintaining privacy.