Types of rollers, calculation & placement

April 9, 2024

A rolling layer is a masonry bond in which bricks lie on the vertical, that is, on the stretch or head.

Motivation phase
There are three types of rollers

1: An enclosed rolling layer.
2: A detached rolling layer
3: A rolling layer detached along one side.

This is an enclosed rolling layer
Information phase
Formulas calculate layer size of different types of rolling layers.

1: Enclosed rolling layer:
Distance to bridge - 1 joint ( 1cm), divide by the layer size of the rising masonry = the number of bricks.
Distance to be bridget - 1 joint divided by the number of brickx = layer measure for the rolling layer.
2: A detached rolling layer:
Same formula as for the enclosed rolling layer, except that here you have to do +1 joint instead of - 1joint.
3: A rolling layer detached along one side:
Divide the distance to be bridget by the layer size of upright masonry = number of bricks
Distance to be bridged divided by the number of bricks = layer size of rolling layer.
Attention:
Note that each of these formulas requires rounding up or down when calculating the number of bricks.
Example: 18.2 bricks is not possible, so that becomes 18 bricks.
Examples of calculating layer size rolling layers:
1: Enclosed rolling layer:
Data: distance to be bridget = 3.25m ( 325cm) - layer size rising masonry = 7.5cm
Solution: 325cm - 1cm = 324 cm : 7.5 cm = 43.2 bricks > 43 bricks.
Layer size rolling layer= 324 cm : 43 bricks = 7.53 cm
2: A detached rolling layer:
The same calculation as the enclosed rolling layer, but here you add 1 joint ( 1cm)
Solution: 325cm +1cm = 326 cm : 7.5 cm = 43.4 bricks > 43 bricks
Layer size rolling layer= 326 cm : 43 bricks = 7.58 cm
3: A rolling layer detached along one side:
Data: Distance to be bridget= 3.25m ( 325cm) - layer size rising masonry= 7.5 cm
Solution: 325 cm : 7.5cm = 43.3 bricks > 43 bricks
Layer size rolling layer= 325 cm : 43 bricks= 7.55 cm

Information phase
Installation of rollers at wall openings.

1: Support with wood, formwork:
Construction that is almost no longer applicable.
By first raising the interior cavaty wall and having to go through the insulation, it is no longer necessary to make a lot of formwork to close the window / door opening.
The wall opening in the interior cavity wall is now closed with a precast lintel, a stalton or a prestressed lintel.
2: Support with an L-profile:
For openings up to 1.50m, a layup is a minimum of 10cm along both sides. A central stut is not needed up to 1.20m.
For openings wider than 1.50m it is recommended to take a minimum of 15cm on bothes sides.
Here it is also recommended to place at least 2 struts, according to the width of the opening.
On these L-profils, the rolling layer is masonry.
The rolling layer is ancored to the interior cavity wall by pre-drilled cavity hooks.
One can also anchor the L-profile directly to the interior cavity wall by bolting or chemical anchoring.
Important: make sure the insulation is not interrupted.

Consolidation phase
Exercices

Calculate the layer size of the next roll layers?
1: Enclosed roll layer:
Details: distance = 3.45m - Ascending layer size= 7.5cm
2: Along 1 side detached rolling layer:
Details: distance = 6.25m - Ascending layer size = 10.2cm
3: Enclosed roll layer:
Details: distance= 2.05m - Ascending layer size= 6.5cm
4: Freestanding rolling layer:
details: distance= 3.10m - Ascending layer size= 5.9cm
5: Along 1 side detached rolling layer:
Details: distance= 2.80m - Ascending layer size= 7.5 cm
Tip: first, carefully read the explanation again!!

Resource information

Level: Level 1
Subject: Construction
Language: English
Estimated time to complete: 15+ minutes