Not really if you apply the open cell while the closed cell is still within its cure window. If closed cell has fully cured you want to rough up the surface a bit first.
Yeah we do flash-and-fill a lot. 1-2 inches of closed cell first for vapor control and air sealing, then fill the rest with open cell. It is cost-effective since closed cell is pricier.
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Mike T. (TX) posted in Contractor Talk: "Best temp settings for 2lb foam in summer heat"New article: "Spray Foam R-Value: The Complete Guide" — Read it nowSarah K. (OH) rated a contractor 5 stars in ClevelandWebinar: Cold Climate Installations — June 18 at 2PM EDT — Register Free28 new members joined this week!Texas Chapter Meetup: June 24 in Dallas — RSVP nowFoamPro_Dave replied: "Graco vs Gusmer after 8 years — my verdict"Mike T. (TX) posted in Contractor Talk: "Best temp settings for 2lb foam in summer heat"New article: "Spray Foam R-Value: The Complete Guide" — Read it nowSarah K. (OH) rated a contractor 5 stars in ClevelandWebinar: Cold Climate Installations — June 18 at 2PM EDT — Register Free28 new members joined this week!Texas Chapter Meetup: June 24 in Dallas — RSVP nowFoamPro_Dave replied: "Graco vs Gusmer after 8 years — my verdict"
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