A method of controlling water accumulation in a cavity formed between adjacent first and second walls, comprising:
- a. providing a flexible elongate cross-shaped member defining first, second, third, and fourth longitudinally extending limbs which form a cross of the cross-shaped member and which are mutually joined along a central longitudinal axis of the member,
- each of the first, second, third, and fourth limbs having a longitudinally extending free end,
- each of the first and second limbs being adjacent relative to each other, and each provided with apertures spaced apart along a longitudinal axis of the member, wherein each of the apertures has a diameter of approximately 15 mm to allow passage of insulating material,
- each of the third and fourth limbs being adjacent relative to each other, and each not provided with apertures and defining a water retaining V-shaped channel therebetween,
- each of the first and second limbs configured to spring out to move relatively closer or further apart,
- each of the third and fourth limbs configured to spring out to move relatively closer or further apart,
- the first and third limbs resiliently pressable against the first wall when the flexible elongate cross-shaped member is inserted in the cavity between the first and second walls, and
- the second and fourth limbs resiliently pressable against the second wall when the flexible elongate cross-shaped member is inserted in the cavity between the first and second walls,
- wherein the elongate member resiliently springs into the cruciform cross section when the elongate member is straightened;
- b. inserting the flexible elongate cross-shaped member in the cavity between the adjacent first and second walls, the third and fourth upper adjacent limbs facing upwards relative to a ground, and the first and second lower limbs facing downwards relative to the ground;
- c. engaging the first wall by resiliently pressing the first and third limbs against the first wall when the flexible elongate cross-shaped member is inserted in the cavity between the adjacent first and second walls;
- d. engaging the second wall by resiliently pressing the second and fourth limbs against the second wall when the flexible elongate cross-shaped member is inserted in the cavity between the adjacent first and second walls;
- and
- e. maintaining a position of the flexible elongate cross-shaped member in the cavity between the adjacent first and second walls with the resilient pressing of the first and third limbs against the first wall and the resilient pressing of the second and fourth limbs against the second wall,
- wherein the cavity has a width defined by a distance between the adjacent first and second walls and the position of the flexible elongate cross-shaped member in the cavity is maintained for a range of cavity widths.