Thunder Internal Door Threshold Seal
A combination seal to improve the performance of inward opening doors with a water bar in the sill but can also be used as a very effective acoustic door seal. It forms the basis of acoustic seals installed by the BBC in its recording studios and auditoria doors.
FEATURES AND BENEFITS
Thunder seals are available in two sizes with the same overall shape. Where an external door is to be sealed a larger section combination is recommended eg TLS/WGS. The smaller section combinations eg. TNG/WHG are more suited to internal applications.
For acoustic sealing applications the Thunder weather bar sections may be reversed so that only a flat aluminium kick plate is visible. For such applications the low rise 3mm threshold plate (section TM) is suitable.
INWARD OPENING DOORS & SINGLE INWARD OPENING DOORS
The TL or TM threshold strip should be mounted on single timber batten (not supplied) which is fixed to the existing sill; both fitted tightly between the stops. The batten should be sized to bring the top of the threshold strip to approximately 2mm above the top of the water bar and have grooves cut into the underside to allow drainage. The stop seals may be run down to the sill or stopped at the top of the WG weatherboard, according to preference. The weatherboard is fixed to the face of the door and adjusted to make light contact with the threshold strip.
For internal doors the smaller TN threshold strip may be used in combination with the WH weatherboard, fitted in a similar fashion to that described above.
PAIRS OF INWARD OPENING DOORS
The threshold strip and batten should be fitted in a continuous length.
SMOOTH FACE APPLICATION
The weatherboard section, WG or WH, can be reversed and rebated into the door to provide a smooth faced threshold seal in combination with an appropriate threshold strip such as the TM.
DRAINAGE, BEDDING & ADDITIONAL PROTECTION
The timber threshold batten should be notched on the underside sufficiently to allow trapped water to drain to outside. The threshold and weatherboard sections should be bedded in silicone sealant.
TL Threshold – 1” No. 6 countersunk screws.
TM Threshold – ¾” No.4 countersunk screws.
TN Threshold – ¾” No.4 countersunk screws.
WG Weatherboard – ¾” No.4 pan headed screws.
WH Weatherboard -¾” No.4 pan headed screws.