Window assemblies and methods for their construction are disclosed. In one aspect, the disclosed window assemblies include wooden side jambs connected to a non-wooden sill assembly via intermediately positioned end caps. In some examples, each end cap includes a main body and a step defined within the main body for supporting an end of the sill assembly, wherein the step extends at an oblique angle to a length of the side jamb associated with the end cap. The provision of an angled or obliquely oriented shelf eliminates the need to mill a similarly shaped structure within the wooden side jambs.

Window assemblies and methods for their construction are disclosed. In one aspect, the disclosed window assemblies include wooden side jambs connected to a non-wooden sill assembly via intermediately positioned end caps. In some examples, each end cap includes a main body and a step defined within the main body for supporting an end of the sill assembly, wherein the step extends at an oblique angle to a length of the side jamb associated with the end cap. The provision of an angled or obliquely oriented shelf eliminates the need to mill a similarly shaped structure within the wooden side jambs.

Window and door opening assemblies are disclosed herein that incorporate one or more high-density insulation cores and methods for constructing thereof. The high-density insulation cores are comprised of polyurethane foam with uniform high density and high structural integrity.

Window and door opening assemblies are disclosed herein that incorporate one or more high-density insulation cores and methods for constructing thereof. The high-density insulation cores are comprised of polyurethane foam with uniform high density and high structural integrity.

A composite fenestration assembly having one or more sub-assemblies including at least one glazing border constructed of a first material and a rigid overlay constructed of a second material to cover and protect an exposed surface of the glazing border while maintaining narrow sight lines and providing an architecturally pleasing exterior appearance.

A composite fenestration assembly having one or more sub-assemblies including at least one glazing border constructed of a first material and a rigid overlay constructed of a second material to cover and protect an exposed surface of the glazing border while maintaining narrow sight lines and providing an architecturally pleasing exterior appearance.

A door assembly and a frame member for a door assembly. The door assembly may include at least one door panel and a door frame having a plurality of frame members including a header and a pair of side jambs. The invention may also be considered a frame member including a storage compartment. The frame member may include a core; and a top piece adjoining the core to form a structural member. The core and the top piece may be a composite of cellulosic material and at least one other material. The top piece may be a two-piece top piece and may include hollow cavities. Also disclosed are door jamb frame members and mullion frame members.

A door assembly. The door assembly may include at least one door panel and a door frame having a plurality of frame members including a header and a pair of side jambs. The invention may also be considered a frame member. The frame member may include a core; and a two-piece top piece adjoining the core to form a structural member. The core and the top piece may be a composite of cellulosic material and at least one other material. The door assembly may further include at least one adjacent panel. Also disclosed are door jamb frame members and mullion frame members.

A door assembly. The door assembly may include at least one door panel and a door frame having a plurality of frame members including a header and a pair of side jambs. The invention may also be considered a frame member. The frame member may include a core; and a two-piece top piece adjoining the core to form a structural member. The core and the top piece may be a composite of cellulosic material and at least one other material. The door assembly may further include at least one adjacent panel. Also disclosed are door jamb frame members and mullion frame members.

Window and door opening assemblies are disclosed herein that incorporate one or more high-density insulation cores and methods for constructing thereof. The high-density insulation cores are comprised of microcellular polyurethane foam.