Relief Angle Brick Concrete Masonry Failures
Continuous steel brick relief angles were installed approximately 4″ below each floor level. Caulking at windows exhibited systemic cohesive failure. Improper detailing as it relates to building movement can be another problem. The concrete expands at a slower rate than the brick masonry the shelf angle is supporting.
Masonry Anchors and Ties
This almost always results in rusting and deterioration of the shelf angle joint. This limit sets the maximum height allowed using prescriptive detailing without conducting a rational analysis. Allows for continuous insulation behind the support angle; saving installation time and improving energy efficiency. A façade made of brickwork is a durable construction, with minimalmaintenance costs and with obvious aesthetic appeal. Since the shelf angle is made of steel, a highly conductive material, this interruption impacts not only the effectiveness of the insulation in general, it provides a considerable thermal bridge over the entire horizontal band of the building at every occurrence.
If it is determined that these angles will be necessary, the next question the structural engineer should ask himself is what the minimum frequency necessary is to support the brick course.
One additional consideration for owners is the maintenance required for shelf angles. Next, when they say “back-up” of cold formed steel studs, does it matter if they are load bearing or non-load bearing?
www.youtube.com/watch?v=17OidIG4hVo Issues With Shelf Relieving Angles – Relief Angle Masonry
The feasibility of restoring and preserving these buildings demands better understanding of problems inherent to their construction and premature degradation. The block back-up units were only 4″ thick. Brackets are fastened to anchor bolts, and shelf angles are inserted into the brackets. As a result, thermal bridging will be eliminated along with the associated energy losses. It seems like the relief angles can really add to the cost of your structural steel (obviously). Third here are my considerations if you were to omit the relief angles, any other suggestions? If the relief angles get separated too much, you can expect window leakage and problems.
The accumulation of moisture expansion of brick, wood drying shrinkage, and wood creep increases with time. After determining the required clearance between the penetrant and the brick veneer based on the expected total cumulative differential movement, the brick veneer must be installed with this clearance around each penetration or fenestration.
At window heads, the upward movement of the brick veneer will tend to open up a gap between the underside of the steel loose-lintel and the window frame.
As the steel lintel moves upward over time, an increasing portion of this trim is exposed. The brick masonry is finished to the closure. Article modified from its original printed version to reflect several updates requested by the authors. Steel doesn’t shrink/shorten much over time or under load, so the differential movement is mostly the fault of the brick. And, not using shelf angles is a damn poor way to help them try to save some money. Different bricks will react slightly differently, so each situation will be slightly different. This allows for a more consistent look to the brick and helps prevent “waves” in the finished wall. This means that water collects in the cavity and then exits through weep holes. The shelf angle provides a good support and logical exit point for through-wall flashing. Don’t forget to yell at the architect to provide appropriate waterproofing protection for your brick ties and shelf angle.
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