How do you build Allen block stairs?
Tight Stairs with AB Capstones
- Excavate the area for the stairway. Make the bottom trench 12 in.
- Place 4 in. (100 mm) of wall rock in the trench and compact thoroughly.
- Install the cap blocks on the first course.
- Fill the blocks and behind to the back of the trench, and compact again to lock the second riser in place.
How do you lay a block on a slope?
Start placing the second row of blocks on the lowest level. Stagger each block so that no joints align. Push the back lip on the blocks firmly against the blocks below them. Continue setting blocks as you work your way up the various levels on the slope.
How tall are the stairs in Allan Block?
With Allan Block, you get an 8 in. rise and a 12 in. run. (200 mm rise and a 300 mm run). On gentle slopes, add pavers or other materials to increase the depth of the tread and length of the run. Landings can soften a long stairway and provide an easy way to tie sets of steps together. Match your stairway design to the natural grade of your slope.
What do you need to know about Allan Block?
Allan Block is the solution for a variety of applications. The installation information demonstrates how to successfully install retaining walls, two-sided patio seating walls, and privacy fencing. Select the application for your project, and learn step by step details on how to plan, design and build with Allan Block.
Where do you put blocks for stair treads?
Place the blocks on top of the compacted stair tread area making sure to allow for 6 in. (150 mm) of wall rock behind the blocks. To ensure that the blocks will be level with the corresponding wall, place a block on the wall as a reference point and level from that block to the block being used for the stair treads.
How do you level a retaining wall for a stairway?
Level retaining wall blocks on base Place the retaining wall blocks with the raised front lip facing up and near the front of the trench. Check the retaining wall blocks for level from side-to-side and front-to-back. Verify the proper position of the base course by examining a string line across the back of the blocks.