Ligna Stone is a popular building material made using the award winning Timbercrete matrix, that has become a preferred option for many new home builders. Ligna Stone is preferred because it weighs up to half the weight of traditional clay fired bricks or cement bricks. In addition, Ligna Stone bricks and blocks can be screwed and nailed together just like ordinary timber.
Ligna Stone bricks and blocks also do not require any specialised training in order to use them. They can be layed in generally the same way as products made from standard cement masonry, such as dry pressed cement blocks and bricks.
To help you get the most from your Ligna Stone or Timbercrete building products, here are 5 bricklaying tips for building with Ligna Stone:
1. Choose the Right Mortar Sand
Selecting the right mortar sand is one of the most important parts of the bricklaying process if you want to avoid shrinkage cracks. For Ligna Stone bricks and blocks, we recommend using clean washed sharp sand, such as "Sydney Sand."
As an alternative to Sydney Sand, you may also use a blend of 3 sands. This blend should be composed of one part Sydney Sand, one part Coarse Washed River Sand, and one part Fatty Brickies Sand, which is a sand that has a high clay content and fine particle size.
2. Use Only Ligna Stone Bricks and Blocks That Have Fully Cured and Dried
Like other cement masonry products, Ligna Stone products are manufactured in a state that leaves them moist until they are subsequently cured. Then shrinking and drying occurs over time. As they are not artificially cured, Ligna Stone bricks and blocks need roughly 13 weeks of drying or curing time to ensure that the product has stabilised and that the dimensions of each brick or block will not change.
When you purchase Ligna Stone bricks and blocks, they will always have a Use after Date included. Make sure to never lay your Ligna Stone products until after the Use after Date has passed for the best results.
If your Ligna Stone bricks and blocks pallets will remain outdoors for a long period of time, make sure that they are properly covered during wet weather. The addition of moisture from the weather or blocks that have become wet directly will need to be allowed to dry out before you can lay them in mortar. You should never lay wet Ligna Stone bricks and blocks.
3. Make Sure to Install Control Joints or Articulation Joints
As a standard rule, cement masonry products need to be installed with control joints or articulation joints. Ligna Stone products also must follow this same rule.
You should install the control joints or articulation joints at intervals of 6 metres or less, depending on the location of the nearest door or window. The bottom edge of a window opening or a top edge of a door opening is a suitable place for a control joint.
Walls that include multiple windows or doors should have a larger number of control joints that have been spaced at a distance of 4 metres or less. Buildings that are constructed on top of reactive soils (those that have high clay content) generally need to have more control joints or articulation joints to accommodate ground movement.
4. Clean Up As You Go
Cleaning up as you install your Ligna Stone products will save you a lot of headaches later on so that you don't have to bother with high pressure and acid cleaning later on. You should also take care in laying Ligna Stone bricks and blocks carefully so that you can minimise excess mortar smears on the brick face. Angling the trowel as you go will help you to cleanly remove away excess bulging mortar.
5. Ironing the Joints
You need to take extra care in ironing the joints, especially when working with single skin or single leaf blocks. These walls require special treatment in order to help you avoid water ingress through the mortar joints. In this case, the mortar joints should be ironed twice:
● The first time the ironing should be done is once the mortar has begun to stiffen. This is a quick pass over in order to prepare the wall for the final ironing.
● The second ironing should be done once you are ready for cleanup at the end of the work day. By this time, the mortar will have further stiffened, so you will need to apply additional pressure. This second ironing is necessary for improving the water tightness of the joint, while also closing up any early microcracks that may have formed.
Raked joints should only be used with brick veneer or double brick type constructions.
Timbercrete Mortar Mix Option A (Aalborg ~ "Bricklayer's White Cement")
|Cement/Lime Mix||Fine Washed||Corse Washed||Fattie|
Timbercrete Mortar Mix Option B (Cement & Lime)
|M3 to M4||1||1||5|
|Cement||Lime||Fine Washed||Corse Washed||Fattie|
|M3 to M4||15.4||15.4||77||107.8|
|M3 to M4||20kg||10.8kg||123kg||154kg|