Norbert V. Krogstad

Norbert Krogstad has investigated distress conditions in several hundred existing buildings, and provided consulting services on numerous cladding systems. He has expertise in the evaluation and resolution of water infiltration, corrosion, cracking, anchorage, and durability problems in exterior wall systems, with a concentration on masonry and curtain wall systems. Mr. Krogstad also specializes in the investigation of moisture and condensation problems. Contact Krogstad via email.

Norbert V. Krogstad's Posts

  • Our crews are having some trouble installing a rubberized asphalt flashing. Pushing the membrane tight into the corner between the horizontal and vertical legs of the flashing at the lap joints is difficult. In many cases, a small gap forms in this location. The membrane can be pushed in tight temporarily, but before the brick is put in, some tenting occurs in many of the locations. How can we avoid this problem?

  • I have a wall system with multiple windows spaced closely together with arches. As a result, the pier between the windows is only 32-in. wide. The wall is about 80-ft long. Obviously I need expansion joints in the 80-ft length of masonry above these arched windows. Where should I install the expansion joints?

  • Is it necessary to put through-wall flashing beneath a masonry sill, if there is another one a few feet below the sill? It seems that this flashing is unnecessary, especially in the case of a single-piece stone sill that extends into the jamb. Are there cases when the through-wall flashing beneath the sill can be omitted? What is the purpose of this flashing?

  • My company is using a flashing system that consists of a rubberized asphalt membrane adhered to concrete masonry back-up, and a stainless steel drip edge. During cold weather, we are having trouble bonding the rubberized asphalt to the concrete masonry and bonding the flashing to the metal drip edge. What can be done to correct these problems?

  • Q What causes the dark vertical lines that occur on gypsum wallboard installed directly over the furring strips in brick veneer/concrete masonry walls?

Close X