Greetings!
In this issue, our Case Study article involves an upgrade to the ornamental railing in the interior courtyard of a 5-story Boston apartment building to comply with the current building code. Our Masonry 101 article describes the challenges for masonry construction with the onset of summer's hot weather.
We trust that you will benefit from the information provided in this publication. If you have any comments or questions, or would like an estimate on a masonry repair project, we can be reached at
617-445-0274 or at www.abbotbuilding.com.
Sincerely,
Michael Norman Vice President Abbot Building Restoration Company, Inc.
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Abbot Upgrades Boston Apartment Building Interior Courtyard
Abbot recently installed an elegant ornamental railing in the interior courtyard at the Burbank Apartments, a 5-story brick and stucco building located at 18 Haviland Street, Boston, MA.
The original detail was a painted, 30-inch high pre-cast concrete railing that extended around the perimeter of each floor of the interior courtyard. As this railing did not meet the 42-inch minimum height required by the Commonwealth of Massachusetts building code, the building owner contacted local architect, Roger Panek, to design an extension. The architectural design called for an elegant ornamental steel addition consisting of two steel rails with circular steel ornaments sandwiched between the rails, steel supports, and capped with a solid brass top rail.
The building owner implemented a standard bidding process, and Abbot was awarded the contract to fabricate and install the new ornamental railing. One of the major challenges in the installation process involved the mitigation of lead paint. The design specifications called for the drilling of a series of holes through the original pre-cast stone cap to anchor the metal rods supporting the new railing. As the original cap contained lead paint, Abbot contracted an environmental specialist to assure the safety of the workers and building occupants.
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Challenges for Masonry Construction in Hot Weather
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Adding water to and remixing fresh mortar periodically is considered good masonry practice in hot weather
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As summer approaches, the onset of hot weather poses several challenges for masonry construction. As ambient temperatures rise, and materials and equipment heat up, moisture evaporates more rapidly, leaving less water available for cement hydration. Compounding factors include low relative humidity and direct sunshine. Effects of Temperature Increases on Mortar - Workability is reduced
- More water is required to maintain a given workability
- A given amount of air-entraining agent yields less entrained air
- Initial and final set occur earlier, and evaporation rates are generally faster
- Units absorb more moisture from the mortar
In addition to effects on workability, rapid drying can result in a lack of sufficient water for hydration of cement in the mortar. Inadequate hydration can lead to a reduction in mortar strength. Exposed mortar surfaces are particularly vulnerable. Evaporation removes moisture more rapidly from the outer surface of a mortar joint. Good Hot Weather Masonry Practices - Select workable, water-retentive mortar mixes
- Schedule construction to avoid hot, midday periods
- Minimize exposure of materials and equipment to direct sunlight
- Use cool water to mix mortar
- Maintain sand piles in damp, loose condition
- Flush metal equipment and wooden mortar boards with cool water before contact with fresh mortar
- Pre-wet clay masonry units if they have high absorption
- Don't spread mortar too far ahead of work
- Place upper units on mortar bed as quickly as possible
- Under extreme drying conditions, use windbreaks, fog sprays, or wall coverings to assure adequate moisture for curing of mortar
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Abbot Building Restoration Company, Inc.
28 Allerton Street, Boston, MA 02119 Tel: 617-445-0274 � Fax: 617-445-0277
estimating@abbotbuilding.com � www.abbotbuilding.com
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Featured Articles
Case Study
Abbot recently upgraded the railing in the interior courtyard of a Boston apartment building to meet building codes.
See full article below
Masonry 101
Onset of summer's hot weather poses greater challenges for masonry construction.
See full article below
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