Frequently asked questions about the Rain- and stormwater systems category
What are Rain- and stormwater systems and what do they include?
Rain- and stormwater systems are assemblies for collecting and conveying roof runoff, comprising gutters, downpipes, bends and outlets, funnel and discharge elements, plus brackets and hangers. They protect foundations and façades by safely directing water away from the building.
How to choose between PVC and sheet rainwater systems?
Choose PVC for a lightweight, corrosion-resistant and cost-effective option suitable for many climates. Sheet (metal) systems are better for higher mechanical loads or specific architectural finishes but require corrosion protection and possibly more maintenance.
What are the common gutter and downpipe diameters in this category?
Common sizes include gutters D125 and pipe diameters such as D75, D90, D100 and D63 found among GAMRAT and RUUKKI products. Select diameter based on roof area and expected rainfall intensity.
Are GAMRAT 3m gutters suitable for a standard pitched roof?
Yes, GAMRAT 3 m gutters (e.g. D125 or D75) are suitable for pitched roofs and are joined with connectors and internal/external corners. Calculate the required number by roof perimeter and plan downpipe locations for adequate drainage.
What is the difference between internal and external gutter corners?
Internal corners (RENNI SISENURK) are used at concave roof joins, external corners (RENNI VÄLISNURK) at convex projecting corners. Match the corner angle (90°, 135°, etc.) to your eaves geometry and the chosen gutter profile.
Do RUUKKI 3m 125 gutters require extra brackets?
Yes, RUUKKI 3 m 125 gutters must be fitted with brackets at the manufacturer’s recommended spacing to prevent sagging and ensure proper flow. Use RUUKKI brackets and follow the installation spacing in the technical documentation.
How are GAMRAT components joined and what connectors are needed?
GAMRAT systems use joint couplers for gutters, pipe connectors, seals, end caps and corner pieces. Match connectors to the diameter (D75, D90, D125) and finish (anthracite, brown) to ensure watertight, neat connections.
What components are needed to discharge water into storm sewers or drainage?
You need gutters’ funnels/discharges, outlet adapters and transition fittings to connect to sewer pipes; for drainage, outlets to inspection chambers or infiltration collectors are used. Match parts to the downpipe type and diameter for compatibility.
What colours/finishes are available (e.g. anthracite, brown) and do they affect durability?
Products come in anthracite and brown finishes for GAMRAT and RUUKKI; coatings protect against UV and corrosion. Finish and base material (PVC vs metal) influence longevity, together with correct installation and site conditions.
How to calculate the number and placement of downpipes for a medium house?
Calculate downpipes based on the roof perimeter and the chosen pipe diameter (e.g. D90/D125); typically one downpipe is placed every 6–12 m of gutter depending on rainfall intensity. Position pipes at corners and intermediate points to ensure even drainage.
What parts are needed to repair a damaged gutter section — are end caps and repair couplers available?
End caps, joint couplers and repair sleeves are available, together with brackets and sealing gaskets to restore gutter integrity. Match parts to the model and diameter (e.g. GAMRAT RENNI ÜHENDUS D100 or D125 caps) for a correct repair.