XL Joinery
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FREQUENTLY ASKED QUESTIONS

Below is a list of common questions we have been asked along with their answer. Please click on a question below to view the corresponding answer. If your question is not covered in this list, please do not hesitate to contact XL Joinery and we'll do our best to answer it for you.

  1. What is the difference between a door with Dowelled construction to that of a door with M&T construction?
  2. What wood (species) is the door made up of?
  3. Are the doors made up of solid or engineered construction?
  4. How much timber can be taken off an Internal door?
  5. How much timber can be taken off an External door?
  6. What thickness of veneer is used on the doors?
  7. How should the doors be finished?
  8. What is the U-Value of a specific external door?
  9. The label on the door states that I cannot use wax, teak oil or varnish…….why not?
  10. I have broken a piece of glass, can you supply a replacement piece? (applies to all internal doors XL Joinery supply)
  11. The glazing bars on my doors are out of line, not square, what can I do?
  12. What is the thickness of glass?
  13. Can you give out glass sizes?
  14. What if I receive an obscure glazed door and it has clear patches on the glass?
  15. Can you tell what the fire rating is for my door?
  16. Can the internal Oak door pair lining set be used on any other size of doors?
  17. What is the thickness of your Door Lining Sets?

Q1. What is the difference between a door with Dowelled construction to that of a door with M&T construction?

Our Dowelled Hardwood doors are manufactured from kiln dried timber and are jointed using fluted dowels and modern adhesives.


Our Mortice & Tenon doors are manufactured from select kiln dried hardwoods, and are constructed using traditional Mortice & Tenon joints and modern adhesives. This ensures that the doors are constructed to the very highest standard. The panels are set in waterproof mastic ensuring that the highest level of weatherproofing is achieved.

Q2. What wood (species) is the door made up of?

Hardwood - Red Hardwood


Pine - Radiata/Elliotti


Oak - American Oak (for doors) & Malaysian Oak (for frames)

Q3. Are the doors made up of solid or engineered construction?

In the interest of environmental concerns and improved performance, products may contain engineered timber components including laminated Timber, MDF or Particleboard.

Q4. How much timber can be taken off an Internal door?

When trimming an internal door to fit, it may be reduced by a maximum of 12mm in both width and height:  The reductions must be split equally from each edge, i.e. to reduce the door width by 12mm, remove 6mm from each side of the door.

Q5. How much timber can be taken off an External door?

When trimming a door to fit, the door may be reduced by a Maximum of 12mm off each side, top and bottom.  Any reductions must be removed equally from each edge.


Q6. What thickness of veneer is used on the doors?

Internal Oak Doors - Stiles and rails: 0.6mm approx, Panels: 0.6mm approx


External Oak Doors - Stiles and rails: 1.2mm approx, Panels: 0.6mm approx


Internal Hardwood Doors - Stiles and rails: 0.6mm approx, Panels: 0.6mm approx


External Hardwood Doors - Stiles and rails: 1.2mm approx, Panels: Solid Laminated Hardwood


Internal Clear Pine Doors - Stiles and rails: 1.0mm approx, Panels: Solid Laminated Pine


External Clear Pine Doors - Stiles and rails: 1.0mm approx, Panels: 9mm Plywood on 2XG & Malton, Panels: Solid Laminated Pine for Stable

Q7. How should the doors be finished?

Internal Paint: A Coat of Primer/Undercoat and min 3 coats of Topcoat


Internal Stain: Good quality internal stain/lacquer finish - min 3 coats.


External Paint: A coat of Primer/Undercoat and min 3 coats of a good quality paint


External Stain: High performance stain - min 3 coats

Q8. What is the U-Value of a specific external door?

Certified U-Values are available for the majority of XL Joinery Doorsets. These U-Values have been determined by Chiltern Dynamics, an independent UKAS accredited testing laboratory. External doors sold separately are available with indicative U-Values only. These indicative U-Values are based upon information from BRE 443 2006 Edition: Conventions for U-Value Calculations, produced by the Building Research Establishment Limited.

Q9. The label on the door states that I cannot use wax, teak oil or varnish…….why not?

When we manufacture a door it has a controlled moisture content, the above mentioned treatments will not seal the moisture content into the door, therefore allowing moisture ingress or loss to occur causing the door to either swell or shrink. Only a fully paint finish (primer, undercoat & gloss) or high performance wood stain/lacquer should be used.

Q10. I have broken a piece of glass, can you supply a replacement piece? (applies to all internal doors XL Joinery supply)

These doors are of cassette construction therefore they are built around the glass and there are no loose beads. We do not have replacement glass. If the customer wants to re-glaze, they would need to router the mould off one side of the glazing aperture, remove the broken glass, put new glass in and acquire a new loose beading to re-glaze the door ( probably as cheap to buy a new door).

Q11. The glazing bars on my doors are out of line, not square, what can I do?

The vertical glazing bars can be tapped back into line, these are dry set into the door and could move in transit.

Q12. What is the thickness of glass?

Flat Glass: 4mm approx


Bevelled Glass: 6mm approx


Double Glazed: 14mm approx


Tripled Glazed: 18mm approx

Q13. Can you give out glass sizes?

We do not give out glass sizes for the reason that the measurements could be taken down or given incorrectly.

Q14. What if I receive an obscure glazed door and it has clear patches on the glass?

This effect is usually caused by a substance "filling in" the glass etching and turning it almost transparent, usually caused by silicone. It can be removed with white sprits and vigorous rubbing of the transparent patch. Once the white sprit as been applied, leave to dry and the glass should become obscured again.

Q15. Can you tell what the fire rating is for my door?

Other than the specific fire doors sold by XL Joinery none of our Internal or External doors have a fire rating. The fire doors sold by XL Joinery all have 1/2 hour fire rating.

Q16. Can the internal Oak door pair lining set be used on any other size of doors?

The length of the lining and door stop is 2134mm long x 20mm thick, 3 lengths of each. If you give the customer these sizes, they can work out the dimensions they need to cut the lining & door stop to. The lining is designed to be used for up to 60" pairs.

Q17. What is the thickness of your Door Lining Sets?

The thickness of the Door Lining Sets are as follows:


Oak Door & Door Pair Lining Sets - 20mm


Walnut Door Lining Sets - 20mm


Softwood Door Lining Sets - 27mm

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