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Author Message J. Peter Jordan Senior Member Username: jpjordan Post Number: 1000 Registered: 05-2004 Posted on Thursday, October 26, 2017 - 07:06 pm:    I have an installation where the markerboards (name brand from a reputable manufacturer) are being used as projection surfaces for "smart/interactive" applications. They have "hot spots" which are causing issues for students and teachers. This is a first for me. Anyone else have this sort of problem? J. Peter Jordan, FCSI, AIA, CCS, LEED AP, SCIP Ronald L. Geren, FCSI, AIA, CCS, CCCA, SCIP Senior Member Username: specman Post Number: 1477 Registered: 03-2003 Posted on Thursday, October 26, 2017 - 07:28 pm:    Was the markerboard surface designed as a projection screen surface? Ron Geren, FCSI, AIA, CCS, CCCA, SCIP www.specsandcodes.com J. Peter Jordan Senior Member Username: jpjordan Post Number: 1001 Registered: 05-2004 Posted on Friday, October 27, 2017 - 09:19 am:    Yes; the manufacturer claims the surface is suitable for both markerboard and projection surface applications. J. Peter Jordan, FCSI, AIA, CCS, LEED AP, SCIP Ronald L. Geren, FCSI, AIA, CCS, CCCA, SCIP Senior Member Username: specman Post Number: 1478 Registered: 03-2003 Posted on Friday, October 27, 2017 - 11:24 am:    Maybe they need to change the type of projector to an ultra-short-throw type. Ron Geren, FCSI, AIA, CCS, CCCA, SCIP www.specsandcodes.com David G. Axt, CCS, CSI ,SCIP Senior Member Username: david_axt Post Number: 1624 Registered: 03-2002 Posted on Friday, October 27, 2017 - 01:27 pm:    Peter, Years ago I had the same reflectance issue on markerboards, so I specified low-gloss markerboards. Then the teachers complained the low-gloss markerboards were hard to clean and caused "ghosting". So I went back to specifying regular markerboards. There are manufacturer's recommended procedures for breaking in a new markerboard. These procedures slightly dull the finish since a new markerboard is actually hard to write on because it is too slick. I would check with the manufacturer and see what they recommend. David G. Axt, CCS, CSI, SCIP Specifications Consultant Axt Consulting LLC Sheldon Wolfe Senior Member Username: sheldon_wolfe Post Number: 989 Registered: 01-2003 Posted on Friday, October 27, 2017 - 03:53 pm:    The answer: Slate and chalk. J. Peter Jordan Senior Member Username: jpjordan Post Number: 1002 Registered: 05-2004 Posted on Friday, October 27, 2017 - 04:22 pm:    Slate has poor qualities for use as a projection surface. J. Peter Jordan, FCSI, AIA, CCS, LEED AP, SCIP