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Modular dwellings comprise attached wall members that enclose an interior area, and a central truss system extending across the dwelling. A lower roof member is supported by a truss system lower chord and wall member, and an upper roof member is supported by a truss system upper chord and a wall mem

Modular dwellings comprise attached wall members that enclose an interior area, and a central truss system extending across the dwelling. A lower roof member is supported by a truss system lower chord and wall member, and an upper roof member is supported by a truss system upper chord and a wall member. The ends of the truss system are supported by a vertical post. The upper part of a wall section and of the upper chord are in co-planar alignment and the lower chord and the upper part of another wall section are in co-planar alignment. Wall panels include an internal frame and a tongue on one side and a groove on the other side which mate with the tongues and grooves of other like panels to compress resiliently deformable seals. A frame portion positioned at the internal side of the extension supports the extension for proper alignment during construction.

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1. A modular dwelling, comprising: (a) a plurality of wall members attached together to enclose an interior of the modular dwelling;(b) a truss system extending across the dwelling supported at each end by a vertical post, the truss system positioned horizontally with a lower chord and an upper chor

1. A modular dwelling, comprising: (a) a plurality of wall members attached together to enclose an interior of the modular dwelling;(b) a truss system extending across the dwelling supported at each end by a vertical post, the truss system positioned horizontally with a lower chord and an upper chord;(c) the lower chord defining a support and wherein the support defines a channel with upper and lower horizontal members and a supporting surface within the channel;(d) a lower roof member comprising a first end supported by the supporting surface, the lower roof member further comprising a second end region opposite the first end supported by a first wall section of the wall members;(e) an upper roof member comprising a first end supported by the upper chord, the upper roof member further comprising a second end region opposite the first end, in a direction opposite to that of the lower roof member, supported by a second wall section of the wall members;wherein the upper surface of the second wall section and the upper surface of the truss system are angled in co-planar alignment in an upper roof plane extending downwardly from the upper surface of the truss system to the upper surface of the second wall section; andwherein the truss system comprises a series of discrete truss members connected together in end to end linear alignment wherein each truss comprises upper and lower channels, each upper and lower channel extending inwardly from upper and lower ends of each truss member and further comprising a plurality of connectors each connector dimensioned to fit within the upper or lower channel of adjacent truss members and connectable thereto to secure the adjacent truss members together. 2. The modular dwelling of claim 1, wherein the support of the lower roof member is oriented above the first wall section so that the lower roof member is slanted downwardly from the first end to the second end region. 3. The modular dwelling of claim 2 wherein the upper surface of the first wall section and the supporting surface of the support are angled in co-planar alignment in a lower roof plane extending downwardly from the supporting surface of the support to the upper surface of the first wall section. 4. The modular dwelling of claim 3 wherein the first wall section further comprises a lower roof extension extending inwardly from the first wall section along the lower roof plane. 5. The modular dwelling of claim 4 wherein the upper and lower roof members comprise a plurality of roof sections aligned along their longitudinal sides, each roof section comprising: (a) a first groove extending laterally along a first longitudinal side of the roof section having a concave inner region extending along the first side facing downwardly when the roof section is on the dwelling and a first tongue extending upwardly from the upper face of the roof section along the opposite longitudinal side of the roof section configured to mate with the first groove, the first groove of a roof section covering a first tongue of an adjacent roof section when the roof section is on the dwelling; and(b) a second groove having a concave inner region facing laterally in the direction of the lateral extension of the first groove extending along the first longitudinal side and a second tongue extending laterally along the opposite longitudinal side of the roof section configured to mate with the second groove, the second groove of a roof section covering a second tongue of an adjacent roof section when the roof section is on the dwelling. 6. The dwelling of claim 2 wherein the vertical posts are dimensioned in length so that the support surface is positioned above the plane of the upper periphery of the first wall section. 7. The modular dwelling of claim 1, wherein the second wall section further comprises an upper roof extension extending inwardly from the second wall section along the upper roof plane. 8. The modular dwelling of claim 7 wherein the upper and lower roof members comprise a plurality of roof sections aligned along their longitudinal sides, each roof section comprising: (a) a first groove extending laterally along a first longitudinal side of the roof section having a concave inner region extending along the first side facing downwardly when the roof section is on the dwelling and a first tongue extending upwardly from the upper face of the roof section along the opposite longitudinal side of the roof section configured to mate with the first groove, the first groove of a roof section covering a first tongue of an adjacent roof section when the roof section is on the dwelling; and(b) a second groove having a concave inner region facing laterally in the direction of the lateral extension of the first groove extending along the first longitudinal side and a second tongue extending laterally along the opposite longitudinal side of the roof section configured to mate with the second groove, the second groove of a roof section covering a second tongue of an adjacent roof section when the roof section is on the dwelling. 9. The modular dwelling of claim 1, wherein the supporting surface of the support and the upper periphery of the first wall section is substantially co-planar so that the lower roof member is substantially horizontal. 10. The modular dwelling of claim 9, wherein the upper and lower sides of the lower roof member are tapered so that the upper surface of the lower roof member is slanted downwardly from the first end to the second end region. 11. The modular dwelling of claim 1, wherein the truss system is positioned in a central region of the dwelling so that the distance between respective first and second end regions of the upper and lower roof members is approximately equal. 12. The modular dwelling of claim 1, wherein the upper chord and lower chord define a cavity between them. 13. The dwelling of claim 12 further comprising a window within the cavity. 14. The modular dwelling of claim 1, wherein the upper and lower roof members each comprising a plurality of roof panels connected together at contacting edges and extending from a first end supported by the truss and a second end region supported by the first and second wall sections. 15. The dwelling of claim 14 wherein the roof panels comprise an upper face with one or more ridges extending upwardly from the face and longitudinally along the panels adjacent at least one contacting edge of the panels. 16. The dwelling of claim 15 further comprising groove members covering at least a part of the ridges and the abutting edges of adjacent panel members. 17. The dwelling of claim 15, wherein the roof panel members comprise: (a) an outer shell forming an inner region;(b) an internal rigid frame within the inner region;(c) a resiliently deformable filler material filling the inner region. 18. The dwelling of claim 17 wherein at least a portion of the frame of a roof panel covering all or a part of an adjacent wall section is positioned so that the frame contacts the wall section in order to provide support of the roof panel by the frame resting on the adjacent wall section. 19. The dwelling of claim 18 wherein the underside of the roof panels further comprise non-deformable attachment segments attached to the portion of the frame and aligned with the tops of adjacent wall sections and further comprising connectors connecting the roof panels to the tops of adjacent wall sections by means of the attachment segments. 20. A modular dwelling, comprising: (a) a plurality of wall members attached together to enclose an interior of the modular dwelling;(b) a truss system extending across the dwelling supported at each end by a vertical post, the truss system positioned horizontally with a lower chord and an upper chord;(c) the lower chord defining a support and wherein the support defines a channel with upper and lower horizontal members and a supporting surface within the channel;(d) a lower roof member comprising a first end supported by the supporting surface, the lower roof member further comprising a second end region opposite the first end supported by a first wall section of the wall members;(e) an upper roof member comprising a first end supported by the upper chord, the upper roof member further comprising a second end region opposite the first end, in a direction opposite to that of the lower roof member, supported by a second wall section of the wall members;wherein the upper surface of the second wall section and the upper surface of the truss system are angled in co-planar alignment in an upper roof plane extending downwardly from the upper surface of the truss system to the upper surface of the second wall section;wherein the second wall section further comprises an upper roof extension extending inwardly from the second wall section along the upper roof plane; andwherein the upper and lower roof members comprise a plurality of roof sections aligned along their longitudinal sides, each roof section comprising:a first groove extending laterally along a first longitudinal side of the roof section having a concave inner region extending along the first side facing downwardly when the roof section is on the dwelling and a first tongue extending upwardly from the upper face of the roof section along the opposite longitudinal side of the roof section configured to mate with the first groove, the first groove of a roof section covering a first tongue of an adjacent roof section when the roof section is on the dwelling; anda second groove having a concave inner region facing laterally in the direction of the lateral extension of the first groove extending along the first longitudinal side and a second tongue extending laterally along the opposite longitudinal side of the roof section configured to mate with the second groove, the second groove of a roof section covering a second tongue of an adjacent roof section when the roof section is on the dwelling. 21. A modular dwelling, comprising: (a) a plurality of wall members attached together to enclose an interior of the modular dwelling;(b) a truss system extending across the dwelling supported at each end by a vertical post, the truss system positioned horizontally with a lower chord and an upper chord;(c) the lower chord defining a support and wherein the support defines a channel with upper and lower horizontal members and a supporting surface within the channel;(d) a lower roof member comprising a first end supported by the supporting surface, the lower roof member further comprising a second end region opposite the first end supported by a first wall section of the wall members;(e) an upper roof member comprising a first end supported by the upper chord, the upper roof member further comprising a second end region opposite the first end, in a direction opposite to that of the lower roof member, supported by a second wall section of the wall members;wherein the upper surface of the second wall section and the upper surface of the truss system are angled in co-planar alignment in an upper roof plane extending downwardly from the upper surface of the truss system to the upper surface of the second wall section;wherein the support of the lower roof member is oriented above the first wall section so that the lower roof member is slanted downwardly from the first end to the second end region;wherein the upper surface of the first wall section and the supporting surface of the support are angled in co-planar alignment in a lower roof plane extending downwardly from the supporting surface of the support to the upper surface of the first wall section;wherein the first wall section further comprises a lower roof extension extending inwardly from the first wall section along the lower roof plane; andwherein the upper and lower roof members comprise a plurality of roof sections aligned along their longitudinal sides, each roof section comprising:a first groove extending laterally along a first longitudinal side of the roof section having a concave inner region extending along the first side facing downwardly when the roof section is on the dwelling and a first tongue extending upwardly from the upper face of the roof section along the opposite longitudinal side of the roof section configured to mate with the first groove, the first groove of a roof section covering a first tongue of an adjacent roof section when the roof section is on the dwelling; anda second groove having a concave inner region facing laterally in the direction of the lateral extension of the first groove extending along the first longitudinal side and a second tongue extending laterally along the opposite longitudinal side of the roof section configured to mate with the second groove, the second groove of a roof section covering a second tongue of an adjacent roof section when the roof section is on the dwelling.