10 a spacer 26 or 27 which is further described below is positioned adjacent the groove 19 so that a fastener positioned within the groove 19 does not interrupt a smooth side supporting surface for the horizontal beams 60 with their webs 64 the principle is the same when both angle profile elements 14 and 15 are used support beam 10 is composed of four equal individual elements 14a 14b 15a and 15b so that a distinct space 36 is defined between the facing sides 16 and 18 this space 36 is particularly important between the sides 16 of an exterior profile 14b or 15b and the complementary sides 18 of an interior profile 14a or 15a all metallic contact between the sides 16 and 18 is avoided by space 36 therefore all metallic thermal bridges between the elements are eliminated fig5 a and 5b illustrate in detail the possibilities for this particular feature an example of the embodiment illustrates here how a mechanical connection which on the one hand avoids thermal flow in the connecting material is on the other hand able to provide good mechanical connection and stability the illustrated example of the embodiment discloses in the inner part of both drawings a releasable mechanical connection 26 which may be used wherever the outer elements are to be kept at the desired distance 36 from the inner elements of the building this connection 26 consists of a non metallic insulating body 28 without thermal conductivity and of sufficient stability the body can be a hard rubber or plastic material in addition to thermal benefits there is also improved sound proofing and the material should also have some elasticity suitable mechanical connecting elements for example bolts and nuts are embedded in axial alignment to one another in insulating body.