Construction boards with coated inorganic facer

1. A construction board comprising:

(i) a foam core having first and second planar surfaces, where the foam core includes a polyisocyanurate cellular structure having an index of at least 175 and being formed by contacting an A-side stream of reactants including an isocyanate compound and a B-side stream of reactants including an isocyanate-reactive compound;

(ii) an interfacial region including a filler dispersed within a matrix, said interfacial region being disposed on said first planar surface of said foam core; and

(iii) a non-woven inorganic mat disposed on said interfacial region opposite said foam such that said core and said mat sandwich said interfacial region.

2. The construction board of claim 1 , where said construction board further comprises a coating layer disposed on said non-woven inorganic mat opposite said interfacial region.

3. The construction board of claim 2 , where said coating layer includes filler dispersed within a matrix.

4. The construction board of claim 3 , where said filler includes an inorganic filler.

5. The construction board of claim 4 , where said inorganic filler is selected from the group consisting of limestone, calcium carbonate, clay, talc, mica, perlite, hollow ceramic spheres, and combinations thereof.

6. The construction board of claim 5 , where said coating includes at least 80% by weight filler and from about 1 to about 15% by weight matrix.

7. The construction board of claim 6 , where said matrix is a polymeric binder.

8. The construction board of claim 1 , where said filler within said interfacial region is an inorganic filler.

9. The construction board of claim 8 , where said inorganic filler is selected from the group consisting of limestone, calcium carbonate, clay, talc, mica, perlite, hollow ceramic spheres, and combinations thereof.

10. The construction board of claim 8 , where said matrix of said interfacial region is a polymeric binder.

11. The construction board of claim 8 , where said interfacial region includes at least 80% by weight filler and from about 1 to about 15% by weight matrix.

12. The construction board of claim 1 , where said construction board further comprises a second interfacial region including a filler dispersed within a matrix; said second interfacial region being disposed on said second planar surface of said foam core.

13. The construction board of claim 12 , where said construction board further comprises a second non-woven inorganic mat disposed on said second interfacial region opposite said foam core so that said foam core and second non-woven mat sandwich said second interfacial region.

14. A construction board comprising:

(i) a foam layer, said foam layer including polyisocyanurate and having first and second planar surfaces;

(ii) a coating layer having first and second planar surfaces, where said first planar surface of said coating is mated to said first planar surface of said foam layer, said coating layer including an inorganic filler dispersed within a polymeric matrix; and

(iii) a non-woven mat having first and second planar surfaces, where said first planar surface of said non-woven mat is mated to said second planar surface of said coating layer.

15. The construction board of claim 14 , where said construction board further comprises a second coating layer having first and second planar surfaces, where said first planar surface of said second coating layer is mated to said second planar surface of said non-woven mat, and where said second coating layer includes an inorganic filler dispersed within a polymeric matrix.

16. A construction board prepared by a process comprising:

(i) providing a non-woven mat having a coating layer disposed on a planar surface thereof, where the coating layer includes an inorganic filler dispersed within a polymeric matrix;

(ii) contacting an A-side stream of reactants including an isocyanate compound with a B-side stream of reactants including an isocyanate-reactive compound to prepare a developing foam; and

(iii) depositing the developing foam on to said coating of said non-woven mat.

17. The construction board of claim 16 , further comprising the step of heating the developing foam within a laminator.

18. The construction board of claim 17 , where after said step of depositing the developing foam on to said coating and prior to heating the developing foam, mating said developing foam to a facer.

19. The construction board of claim 18 , where said facer includes a coating layer disposed on a planar surface thereof, where the coating includes an inorganic filler dispersed within a polymeric matrix.