Masonry Magazine October 1994 Page. 18
DUR-O-WAL
FLASHING
SYSTEMS
Whether you need economical composite flashing or premium stainless steel, DUR-O-WAL's got you covered.
DUR-O-WAL DCF
A unique composite flashing that provides all the benefits of copper without the negatives. Unaffected by extreme temperatures or deterioration due to acid or alkali reactions, it can be used virtually anywhere through-wall flashing is needed. Flexible, easy-to-use and less expense than most copper composites, DCF offers two economical choices:
DCF-1500S-A base material of metal foil encapsulated in a polyester film and bonded to a fiberglass scrim.
DCF-1501B-A base material of vinyl ethylene film bonded to a fiberglass reinforcement.
DUR-O-WAL STAINLESS STEEL
DUR-O-WAL stainless type 302/304 flashing for maximum corrosion resistance and longevity can be used for the most demanding through-wall flashing applications. Available in 16 ga., 22 ga. and 26 ga. sheets. Drip-edge flashing (D/A-1526) and other preformed shapes available on request.
For more information contact your factory authorized distributor or call toll-free:
1-800-323-0090
DUR-O-WAL, INC.
3115 N. Wilke Road, Suite A
Arlington Heights, IL 60004
(708) 577-6400 Fax (708) 577-6418
Masonry materials involving cementitious material(s) are classed as being the most sensitive to weather conditions. Temperature effects are the most critical; moisture effects are less critical, but worthy of concern.
The Portland cement fraction of the masonry mortar has "normal" water demand, setting and hardening characteristics and rate of strength development during "normal" weather conditions. Portland cement containing mixtures in the presence of cold temperatures require lower water contents and possesses slower setting and hardening characteristics than their normal temperature counterparts. Conversely and when the temperature is above normal, the portland cement requires higher water contents and possesses faster setting and hardening characteristics than its normal temperature counterpart.
Temperature also affects the workability characteristics of the mortar containing portland cement. Mortars are classed as more workable during cold temperature and require less frequent tempering while on the mortar board. Mortars are classed as less workable during hot temperatures and require more frequent tempering while the mortar is on the board.
The hydrate lime fraction of the masonry mortar contributes an exceedingly fine (high surface area) material capable of adsorbing water, entailing a high degree of cement hydration. Hydrated lime reacts with water and carbon dioxide in the atmosphere to produce a denser mortar. Mason's sand normally contains free moisture, which freezes during cold weather and promotes some evaporative cooling during hot dry weather. Clay masonry units absorb water and the absorbed water freezes during cold weather. Concrete masonry units absorb water and expand.
Continued on Page 29
CHECKLISTS FOR ALL WEATHER CONDITIONS
The following checklists should be consulted while preparing Submittals for Weather Protection
ALL WEATHER CONSTRUCTION PROCEDURES
* Submittals
Certificates of Compliance with Manufacturers literature of Laboratory Test Reports
* Portland Cement
* Masonry Cement
* Hydrated Lime
* Mason's Sand
* Concrete Masonry Units
* Clay Masonry Units
* Mortar Conformance to Specification
Property Specification C 270 Test report attached.
Proportion Specification C 270 No tests required.
* Reinforcement and Masonry Accessories
Joint reinforcement type (truss, ladder, other) (gage, grade, corrosion protection)
* Masonry Anchors
* Grout Conformance to Specification
Specification ASTM C 476
Slump between 8 and 11 inches.
* Sample Panels
When required:
Sample panel at least 4 square feet.
Sample panel is standard for Work.
Retain until Work accepted.
* Masonry Execution
Materials to be received from supplier in weather protected condition.
Materials to be stored on site away from traffic pattern, high and dry.
Provisions for covering walls at work stoppages.
Provisions for covering wall after completion of masonry segment.
18 MASONRY-SEPTEMBER/OCTOBER, 1994