Types of expansion joint.
Block wall expansion joints.
A masonry expansion joint is a complete break in the masonry wall to allow for the entire structure to move under loading temperature related expansion contraction etc.
The expansion joints are incorporated to endure the stresses.
Change in wall height or thickness see figure 1 figure 2 change of loading see figure 3 abutments of walls and columns see figure 4 junctions of dissimiliar materials see figure 5.
These joints will absorb the pressure created by the expansion by giving the masonry wall flexible space to expand.
Aggregate concrete blocks position of movement joints consideration for the location of movement joints should be given at.
This allowed movement helps prevent distortion and cracking.
High walls tend to experience greater movement towards the top of the wall than in the lower extremities.
While these attributes are the primary basis for concrete masonry s.
Based on the location of joint expansion joints are divided into following types.
Guidance for spacing and location of control joints can be found in the national concrete masonry association ncma tek note 10 02c control joints for concrete masonry walls empirical method 2010.
The siteworx foam expansion joint filler.
Our siteworx foam expansion joint filler is made from polyethylene foam which comes with low moisture properties.
To help match mortar the foam comes in white.
This is because of greater loads in the lower parts of the wall.
An expansion joint is simply a disconnection between segments of the same materials.
This is the perfect filling for expansion joints in brickwork and blockwork as it expands and contracts with the movement through a building.
In the concrete block construction the expansion joints are expressed as control joints.
The purpose of a masonry control joint is to allow free movement while maintaining the weathertightness of the construction.
Expansion control joints to control the expansion and protect the wall structure from cracking under pressure masons install vertical control joints at specific locations.
As mentioned in the expansion joints discussion the design of control joint spacing and location is the responsibility of the designer.
Control joints are often constructed to transfer lateral loads across the joint.
These principles generally apply to both horizontal and vertical joints.
Like control joints expansion joints should be provided near corners in the masonry near returns or changes in the planes of the masonry wall at an y significant changes in the wall s height or stiffness at changed in foundations and at regular intervals along.
