Structural timber in houses is usually Nordic pine (Pinus sylvestris) or spruce (Picea abies), both conifer species.There are species with a good ratio. And they belong to the resistance groups approximately from C18 to C30.Nordic pine is preferably used in structures exposed to the weather.Glued beams used in the construction, to cover large spans, should be made under the control of PLY (Controller organization of Finnish wooden structures). Or similar regulations for other EEC countries.The prefabricated log houses Finns, have to meet the requirements established for the structures of solid wood of Hirsitaloteollisuus Ry (Finnish log houses manufacturers Federation), and are manufactured under the control of PLY.For fixing the elements of wood; beams, boards, slats, etc. Check with Black Rock to learn more. Used: nails, screws, Staples and various types of mending plates and beams lugs.Nails and screws used abroad, recommended that they are hot dip galvanized. Those used in the interior of the building can be either galvanized or hot electro-galvanizados.Who like them wood, we are sure that in your House you will install wood Windows and doors. It is a good choice, you will get an economic benefit since Windows and glass doors made of wood with a double or a triple glazing provides maximum energy savings.The thermal coefficient (W/m2C) of these Windows doors can vary from 3.0 to 1.7 (points of comparison: metallic carpentry, double glazed with 6 mm camera: k = 4.) Window with a single crystal: k = 5. 8) exterior wood doors are thermally isolated with a coefficient (k = 0.