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According to one embodiment, a halogen free wall system is described. The wall system includes wall studs that are coupled together to form a frame and polyisocyanurate insulation boards that are positioned on an exterior side of the frame to form an exterior wall. The polyisocyanurate foam boards i

According to one embodiment, a halogen free wall system is described. The wall system includes wall studs that are coupled together to form a frame and polyisocyanurate insulation boards that are positioned on an exterior side of the frame to form an exterior wall. The polyisocyanurate foam boards include a polyisocyanurate core having a halogen free fire retardant. Wall boards are attached to an interior side of the frame to form an interior wall. The wall boards are free of a halogenated fire retardant. The wall studs, polyisocyanurate foam boards, and wall board define a plurality of wall cavities within which an insulation material is positioned. The insulation material is free of a halogenated fire retardant.

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1. An insulated structure comprising: a plurality of structural support members coupled together to form a frame;a plurality of polyisocyanurate foam boards attached to an exterior side of the frame to form a continuous insulative exterior wall or surface of the structure;a plurality of wall boards

1. An insulated structure comprising: a plurality of structural support members coupled together to form a frame;a plurality of polyisocyanurate foam boards attached to an exterior side of the frame to form a continuous insulative exterior wall or surface of the structure;a plurality of wall boards attached to an interior side of the frame to form an interior wall or surface of the structure, wherein the structural support members, the polyisocyanurate foam boards, and the wall boards define a plurality of wall cavities;a plurality of fasteners that attach the polyisocyanurate foam boards and the wall boards to the respective sides of the frame, wherein each fastener comprises an elongate shaft that penetrates through a respective board and into a respective structural support member to couple the components together; andan insulation material that is positioned within at least one of the wall cavities of the structure;wherein each polyisocyanurate foam board includes a polyisocyanurate core produced by reacting components that include: an isocyanate;a polyol; andat least one phosphorus containing non-halogenated fire retardant, the polyisocyanurate core forming a sufficiently stable char when exposed to flame conditions in accordance with an ASTM E-84 that enables the polyisocyanurate core to pass the ASTM E-84 test, wherein the polyisocyanurate core foam board comprises an initial R-value of at least 6.5, and wherein the polyisocyanurate core foam board exhibits an ASTM E1354-11b performance equivalent with or better than a similar polyisocyanurate foam board having a halogenated fire retardant tris(2-chloroisopropyl)phosphate (TCPP);wherein the polyisocyanurate core comprises an average foam cell size of no more than 200 microns. 2. The insulated structure of claim 1, wherein the polyisocyanurate core further comprises between 1 and 10 weight percent of a hydrocarbon blowing agent. 3. The insulated structure of claim 1, wherein each polyisocyanurate foam board further includes a foil facer attached to an exterior side thereof, and wherein the polyisocyanurate core has an isocyanate index of greater than 200. 4. The insulated structure of claim 1, wherein the insulation material that is positioned within the at least one of the wall cavities is a spray foam material, a fiberglass material, or a combination thereof. 5. The insulated structure of claim 1, further comprising an additional wall board that is attached to the exterior side of the frame and positioned between the plurality of polyisocyanurate foam boards and the frame. 6. The insulated structure of claim 1, wherein the at least one phosphorus containing non-halogenated fire retardant includes one or more of: organo-phosphate;organo-phosphite; ororgano-phosphonate. 7. The insulated structure of claim 6, wherein the phosphorous containing non-halogenated fire retardant is diethyl hydroxymethyl phosphonate (DEHMP). 8. The insulated structure of claim 1, wherein the phosphorous containing non-halogenated fire retardant is isocyanate reactive. 9. The insulated structure of claim 1, wherein each polyisocyanurate foam board has a density of between about 1.5 and 2.5 pcf. 10. A method of forming a wall of a structure comprising: coupling a plurality of structural support together to form a frame;attaching a plurality of polyisocyanurate foam boards to an exterior side of the frame to form an insulative exterior wall or surface;attaching a plurality of wall boards to an interior side of the frame to form an interior wall or surface, wherein the structural support members, polyisocyanurate foam boards, and wall boards define a plurality of wall cavities; andpositioning an insulation material within at least one of the wall cavities to insulate an interior space of the structure;wherein at least one polyisocyanurate foam board includes a polyisocyanurate core produced by reacting components that include: an isocyanate;a polyol; andat least one phosphorus containing non-halogenated fire retardant, the polyisocyanurate core forming a sufficiently stable char when exposed to flame conditions in accordance with an ASTM E-84 that enables the polyisocyanurate core to pass the ASTM E-84 test, wherein the polyisocyanurate core foam board comprises an initial R-value of at least 6.4, and wherein the polyisocyanurate core foam board exhibits an ASTM E1354-11b performance equivalent with or better than a similar polyisocyanurate foam board having a halogenated fire retardant tris(2-chloroisopropyl)phosphate (TCPP);wherein the polyisocyanurate core comprises an average foam cell size of no more than 200 microns. 11. The method of claim 10, wherein the polyisocyanurate core further comprises between 1 and 10 weight percent of a hydrocarbon blowing agent. 12. The method of claim 10, wherein the at least one polyisocyanurate foam board further includes a foil facer attached to an exterior side thereof, and wherein the polyisocyanurate core has an isocyanate index of greater than 200. 13. The method of claim 10, wherein the insulation material that is positioned within the at least one of the wall cavities is a spray foam material, a fiberglass material, or a combination thereof. 14. The method of claim 10, wherein the phosphorous containing non-halogenated fire retardant includes one or more of: organo-phosphate;organo-phosphite; ororgano-phosphonate. 15. The method of claim 10, wherein the phosphorous containing non-halogenated fire retardant is diethyl hydroxymethyl phosphonate (DEHMP). 16. The method of claim 10, wherein the phosphorous containing non-halogenated fire retardant is isocyanate reactive. 17. The method of claim 10, wherein the at least one polyisocyanurate foam board has a density of between about 1.5 and 2.5 pcf. 18. A halogen free wall system comprising: a plurality of structural support members coupled together to form a frame;a plurality of polyisocyanurate insulation wall boards positioned on an exterior side of the frame to form an exterior wall or surface of the wall system, the polyisocyanurate foam insulation boards being produced by reacting an isocyanate and a polyol so that the polyisocyanurate foam insulation boards have an isocyanate index greater than 200, the polyisocyanurate foam insulation boards including a polyisocyanurate core having a halogen free fire retardant, the polyisocyanurate core forming a sufficiently stable char when exposed to flame conditions in accordance with an ASTM E-84 such that the polyisocyanurate core passes the ASTM E-84 test, the polyisocyanurate core comprising an initial R-value of at least 6.5 and an average foam cell size of no more than 200 microns;a plurality of wall boards attached to an interior side of the frame to form an interior wall or surface of the wall system, the plurality of wall boards being free of a halogenated fire retardant, wherein the structural support members, the foam boards, and the wall boards define a plurality of wall cavities; andan insulation material that is positioned within at least one of the wall cavities of the structure, the insulation material being free of a halogenated fire retardant. 19. The halogen free wall system of claim 18, further comprising a plurality of additional wall boards that are positioned on the exterior side of the frame between the polyisocyanurate insulation wall boards and the frame, the plurality of additional wall boards being free of a halogenated fire retardant. 20. The halogen free wall system of claim 19, further comprising cladding positioned on an exterior side of the polyisocyanurate insulation wall boards, the cladding being free of a halogenated fire retardant. 21. The halogen free wall system of claim 18, wherein the wall board includes dry wall.