provided the joint strength and 

 rigidity obtainable in factory gluing. 

 The relatively recent development of 

 fast-curing, gap-filling phenolic and 

 phenol-resorcinol resin adhesives for 

 construction may allow onsite gluing 

 to further expand into the area of 

 primary load-bearing connections 

 {American Institute of Timber Con- 

 struction (AITC), 1974}. 



tion. 



(2) Shop or Factory Applica- 

 Conditions of service de- 



termine the type of adhesive required 



In general, dry-use (water-resistant) 



adhesive should be used for interior 



locations and wet-use (waterproof) 



adhesive for exterior locations. 



However, under some conditions, a 



member glued with dry-use adhesive 



may be used satisfactorily on an 



exterior member for certain uses. It 



is not practical to use both types of 



adhesives within the length of the 



same member. If any part of a 



member's length requires wet-use 



adhesives, wet-use adhesives must be 



used throughout its length. It 



should be kept in mind that the use 



of a wet-use adhesive will generally 



increase the cost of a laminated member; therefore, it 



fied unless actually needed. 



Figure 71 



Pile dolphin 

 with wire rope 



should not be speci- 



(a) Dry-Use Adhesives . Casein adhesive with a suitable mold 

 inhibitor is the standard dry-use adhesive of the structural glued laminated 

 timber industry. It has proved its dependability for over two generations 

 in Europe and North America. It is used in large quantities by other wood 

 products manufacturers as well as this industry. Casein adhesive with mold 

 inhibitor is satisfactory in properly designed, constructed, and maintained 

 buildings as long as the members are not subjected to repeated wettings or 

 high humidity over a long period of time. Although casein adhesives can 

 withstand some wetting during erection of the members, special attention 

 should be given to the protection of the top face of beams, rafters, or 

 arches during shipment and erection when end or beveled faces are exposed at 

 these locations. Angular cuts are often made that pass through one or more 

 laminations and result in feathered ends on the individual laminations. 

 These surfaces have greater than average moisture absorption and should be 

 properly end-sealed to prevent delamination of the feathered ends. Although 

 such damage is not likely to be of structural concern, it may be unsightly. 

 All end cuts should be well sealed (AITC, 1974). 



1 Exterior Use. Two major requirements must be met to 

 ensure proper performance of casein adhesives in exterior locations. If the 

 requirements cannot be met, wet-use adhesives shall be used. Complete 



267 



