Building a garden room with IronmongeryDirect & RUMI Custom Cabins

After we joined RUMI Custom Cabins on site to see how they constructed their Garden Bars, we’re back again to give you the inside knowledge of how they build a Garden Room with adjoining Storage Room - from start to finish, for this instalment of our Outdoor Projects series.

Stage 1 – Substructure & Joist Deck

Stage one of the project involved providing the groundwork for the Garden Room to sit on, this was achieved by installing a set of ground screws.

It was then time to construct the timber joist deck then fixing that to the substructure. Noggins are then installed between the joists to make sure they are straight and structurally sound. The deck flooring started to take shape. The joists were insulated with 90mm PIR insulation, then the team installed and secured the CaberDek flooring to the joists.

Joist Deck Installation

Products Used:

TIMCO 34° FirmaHold Clipped Head Nail and Gas - First Fix - 3.1 x 90mm - HDGV - 2 Fuel Cells (616531)

Reisser Timber Connector Screws - 8.0 x 120mm - Pack of 25 x5 (224102)

Simpson Strong Tie Joist Hanger - Truss Hanger Mono - 47mm width x50 (407050)

TIMCO Galvanised Square Twist Nail - 40 x 3.75mm - 2.5kg Pack (821466)

Reisser Timber Connector Screws - 6.0 x 80mm - Pack of 25 x3 (540343)

Soudal Trade 30min D4 PU Wood Adhesive - 750g – Brown x2 (530906)

Spax Flooring Screw - 4.5 x 60mm - Pack of 300 x1 (291096)

Broadfix Horseshoe Packer - 101 x 43 x 5mm - Brown - Pack of 200 (943073)

Broadfix Horseshoe Packer - 101 x 43 x 10mm - Grey - Pack of 200 (512458)

Stage 2 – Walls

Stage 2 focused on building the walls of the Garden Room. RUMI started with the rear wall first. OSB, felt, timber battens and metal cladding were installed on to timber studwork and the wall, fully constructed, was raised in to place due to restricted access.

The rest of the stud work walls were then constructed and erected, with openings to the front elevation for the store room door as well as the garden room doors and window, using a combination of screws and nails. The internal wall, separating the Garden Room from the Store Room was erected, following which felt was fixed externally with staples.

Wall Construction

Products Used:

TIMCO 34° FirmaHold Clipped Head Nail and Gas - First Fix - 2.8 x 50mm - HDGV - 3 Fuel Cells (184450)

TIMCO 34° FirmaHold Clipped Head Nail and Gas - First Fix - 3.1 x 75mm - FirmaGalv - 2 Fuel Cells (250554)

Broadfix Horseshoe Packer - 101 x 43 x 1mm - Yellow - Pack of 200 (738647)

Broadfix Horseshoe Packer - 101 x 43 x 3mm - Blue - Pack of 200 (772970)

Tacwise 140 Series Staples (T50, G11, 140) - 8mm - Galvanised - Pack of 2000 (772090)

Stage 3 – Roof

After the walls had been erected, it was time to start constructing the roof. The roof joists were put in situ, with the overhang for the roof carefully calculated, allowing for sufficient ventilation. Noggins were fitted to strengthen the roof structure. This was then covered with OSB board, ready for the EPDM membrane finish to be laid later. Fascia vents were fitted to provide ventilation to the roof.

Products Used:

Reisser Cutter Woodscrew - 6.0 x 180mm - Pack of 100 (655858)

Simpson Strong Tie Truss Clip - 47mm Width x30 (882010)

Soudal Trade 30min D4 PU Wood Adhesive - 750g – Brown x2 (530906)

Spax Flooring Screw - 4.5 x 60mm - Pack of 300 x1 (291096)

Stage 4 – Doors & Windows

The next stage was to install the uPVC Window and French Doors for the Garden Room. The Storage Room door was also fitted. This consisted of a hardwood frame and a solid core door, suitable for external use. Installation of these utilised silicone sealant, expanding foam and glazing packers.

Whilst RUMI were installing the doors and windows, the electrician commenced his 1st fix. He ran all of the necessary wiring within the stud walls and roof, ready for the 2nd fix at the end of the project.

uPVC Doors and Windows

Products Used:

Evo-Stik Trade Frame Silicone - 290ml – Clear x3 (805490)

Soudal Soudafoam SWS Flexifoam - Gun Grade - 750ml x2 (481292)

Broadfix Glazing Packer Assortment Set - Pack of 120 (206494)

Reisser R2 Retinox Stainless Steel Woodscrews - 4.5 x 50mm (136206)

Spax RA Frame Anchor - 7.5 x 120mm (878119)

Enduro Max Parliament Hinge - 102 x 50 x 102 x 3mm - Satin Stainless Steel – Pair x2 (374212)

UNION 2105S StrongBOLT 5 Lever Deadlock - 68mm Case - 45mm Backset - Satin Stainless Steel (853314)

Stage 5 – Roof and Wall Finishes

Cedar cladding was used as fascia board, fitted to the outside of the ventilation strips, following which the EPDM roof was laid, making the Garden Room watertight. RUMI then fitted vertical and horizontal battens, ready for the cedar cladding. Cedar was also used for the trims for around the doors and windows.

Cain Fascia

Products Used:

TIMCO 34° FirmaHold Clipped Head Nail and Gas - First Fix - 2.8 x 50mm - HDGV - 3 Fuel Cells (184450)

TIMCO 34° FirmaHold Clipped Head Nail and Gas - First Fix - 3.1 x 75mm - FirmaGalv - 2 Fuel Cells (250554)

Stage 6 – Internal Finishing Touches

The final steps of the project then commenced. The stud walls and the roof were insulated with 90mm PIR insulation, following which the Garden Room was plaster boarded, ready for the plasterer. Once the plaster was dry, it was time to install the semi-solid flooring and skirting. It was then painted. For the storage room, the finishing touches consisted of ply-lining the walls and installing shelves. The electrician then completed the 2nd fix, and the keys were handed over to the client for them to enjoy their new RUMI Custom Cabin.