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An insulated wall system and related methods of installing walls is set forth. The system includes a plurality of metal purlins (10), a plurality of outer panels (2), a plurality of thermal insulation blocks (4), cleats (14), and fasteners (12). The metal purlins (10) can form a parallel array of pu

An insulated wall system and related methods of installing walls is set forth. The system includes a plurality of metal purlins (10), a plurality of outer panels (2), a plurality of thermal insulation blocks (4), cleats (14), and fasteners (12). The metal purlins (10) can form a parallel array of purlins. The outer panels (2) can be attached to the metal purlins (10) in the parallel array. The thermal insulation blocks (4) can be disposed between the metal purlin (10) and the outer panel (2). The cleat (14) can be disposed between the thermal insulation blocks (4) and the outer panel (2) and has a protrusion which is capable of securing the thermal insulation block (4) and inhibits lateral movement between the thermal insulation block (4) and the cleat (14).

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1. An insulated wall system, comprising: a plurality of metal purlins, each metal purlin being configured to form a parallel array of purlins such that voids exist between the metal purlins in the parallel array;a plurality of outer panels, each panel being configured to be attached to the metal pur

1. An insulated wall system, comprising: a plurality of metal purlins, each metal purlin being configured to form a parallel array of purlins such that voids exist between the metal purlins in the parallel array;a plurality of outer panels, each panel being configured to be attached to the metal purlins to form an outer deck;a plurality of thermal insulation blocks, each thermal insulation block being disposed between the metal purlin and the outer panel;a first cleat configured to cap a side of the thermal insulation block and disposed between the thermal insulation block and the outer panel, and a second cleat oriented opposite the first cleat to sandwich the thermal insulation block, wherein each cleat includes a protrusion which secures the thermal insulation block and inhibits lateral movement between the thermal insulation block and the cleat;a fastener, wherein the fastener is configured to secure the outer panel, the first cleat, the second cleat, and the thermal insulation block to the metal purlin. 2. A system as in claim 1, wherein the voids between the metal purlins are filled with insulation. 3. A system as in claim 2, wherein the insulation includes a first layer of insulation disposed between the plurality of outer panels and the plurality of thermal insulation blocks. 4. A system as in claim 2, wherein the insulation includes a second layer of insulation disposed between the plurality of thermal insulation blocks and the plurality of metal purlins. 5. A system as in claim 4, wherein the second insulation layer is supported by support rails which are configured to span the voids between the metal purlins and to be secured to the metal purlins. 6. A system as in claim 1, wherein the voids between the metal purlins are substantially open. 7. A system as in claim 1, wherein the first and second cleats comprise a u-shape. 8. A system as in claim 1, wherein the system includes an adhesive layer which is configured to be disposed between the thermal insulation block and at least one of the cleats. 9. A system as in claim 1, wherein the first and second cleats comprise u-shaped channels. 10. A system as in claim 1, wherein the outer panels are metal outer panels. 11. A system as in claim 1, wherein the protrusions on the first and second cleats penetrate the thermal insulation block. 12. A method of installing an insulated wall, comprising: arranging a plurality of metal purlins in a substantially parallel configuration such that voids exist between the metal purlins;disposing a plurality of cleats about opposite sides of a plurality of thermal insulation blocks to sandwich the thermal insulation blocks, each of said cleats being configured to cap a side of at least one thermal insulation block and having a protrusion which secures the thermal insulation block and inhibits lateral movement between the thermal insulation block and the cleat;disposing cleats on one side of the thermal insulation blocks adjacent the plurality of metal purlins;disposing an outer panel adjacent to the cleats on the opposite side of the thermal insulation blocks; and securing the outer panel, the cleats, and the thermal insulation block to the metal purlin with a fastener. 13. A method as in claim 12, wherein the method further includes the step of disposing insulation in the voids between the metal purlins. 14. A method as in claim 13, wherein the method includes securing support rails to the metal purlins such that the support rails span the voids between to the metal purlins and support the insulation, wherein the insulation is also disposed between the outer panel and the metal purlin. 15. A method as in claim 12, wherein the method further includes the step of disposing insulation between the plurality of metal purlins and the plurality of thermal insulation blocks. 16. A method as in claim 12, wherein the fastener is a threaded fastener having a first threaded region and a second threaded region which are separated by an unthreaded region and wherein the thermal insulation block has a thickness and the unthreaded region of the threaded fastener has a length which corresponds to the thickness of the thermal insulation block such that the unthreaded region is substantially disposed in the thermal insulation block. 17. A method as in claim 12, wherein the plurality of metal purlins are oriented vertically such that a wall system is formed. 18. A system as in claim 1, wherein the first cleat, the second cleat, and the insulation block extend substantially the same length as the metal purlin.